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Medical Dictionary - Dictionary of Medicine and Human Biology


Medical Dictionary


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helleborin (he-leb′o-rin, hel-e-bo′rin)
A toxic glycoside from Veratrum viride (green hellebore); a narcotic.

helleborism (hel′e-bor-izm)
A condition resulting from poisoning by Veratrum Helleborus.

helleborus (he-leb′o-rus)
Black hellebore, the dried rhizome and roots of H. niger (family Ranunculaceae); used as a cardiac and arterial tonic, diuretic, and cathartic. [G. helleboros]

Heller
Arnold L.G., German pathologist, 1840–1913. See H. plexus.

Heller
Ernst, German surgeon, 1877–1964. See H. operation.

Hellin
Dyonizy (Dionys), Polish pathologist, 1867–1935. See H. law.

Helly
Konrad, Swiss pathologist, *1875. See H. fixative.

Helmholtz
Hermann L.F. von, German physician, physicist, and physiologist, 1821–1894. See H. axis ligament, H. energy, H. theory of accommodation, H. theory of color vision, H. theory of hearing, H.-Gibbs theory, Gibbs-H. equation, Young-H. theory of color vision.

helminth (hel′minth)
An intestinal vermiform parasite, primarily nematodes, cestodes, trematodes, and acanthocephalans. [G. helmins, worm]

helminthagogue (hel-minth′a-gog)
SYN: anthelmintic (1) . [G. helmins, worm, + agogos, leading]

helminthemesis (hel-min-them′e-sis)
The vomiting or expulsion through the mouth of intestinal worms. [G. helmins, a worm, + emesis, vomiting]

helminthiasis (hel-min-thi′a-sis)
The condition of having intestinal vermiform parasites. SYN: helminthism, invermination.

helminthic (hel-min′thik)
1. Helmintic. 2. SYN: anthelmintic (1) .

helminthism (hel′min-thizm)
SYN: helminthiasis.

helminthoid (hel-min′thoyd)
Wormlike. [G. helminthodes, wormlike, fr. helmins, worm, + eidos, resemblance]

helminthology (hel-min-thol′o-je)
The branch of science concerned with worms; especially the branch of zoology and of medicine concerned with intestinal vermiform parasites. SYN: scolecology. [G. helmins, worm, + logos, study]

helminthoma (hel-min-tho′ma)
A discrete nodule of granulomatous inflammation (including the healed stage) caused by a helminth or its products, so termed on the basis of certain gross resemblances to a neoplasm. [G. helmins, worm, + -oma, tumor]

helminthophobia (hel′min-tho-fo′be-a)
Morbid fear of worms. [G. helmins, worm, + phobos, fear]

Helminthosporium (hel-min-tho-spor′e-um)
A saprobic fungus that is usually isolated in clinical laboratories; it has determinant parallel-walled conidiophores; commonly misapplied to isolates of Drechslera.

helmintic (hel-min′tik)
1. Relating to or infected with parasitic worms. 2. SYN: anthelmintic (1) .

Heloderma (he-lo-der′ma)
The only genus of poisonous lizards, such as the Gila monster, so named because of the tubercular scales which cover their bodies. They are native to Mexico and the southwestern U.S. [G. helos, nail, + derma, skin]

Helvella esculenta (hel-vel′a es-ku-len′ta)
SYN: Gyromitra esculenta.

Helweg
Hans K.S., Danish physician, 1847–1901. See H. bundle.

Helweg-Larssen
H., Hans F., 20th century Danish dermatologist. See Helweg-Larssen syndrome.

hem-, hema-
Blood. SEE ALSO: hemat-, hemato-, hemo-. [G. haima]

hemachrome (he′ma-krom, hem′a-)
The coloring matter of the blood, hemoglobin or hematin. [hema- + G. chroma, color]

hemacytometer (he′ma-si-tom′e-ter, hem′a-)
SYN: hemocytometer.

hemacytozoon (he′ma-si-to-zo′on, hem′a)
SYN: hemocytozoon.

hemadostenosis (he′ma-do-ste-no′sis, hem′ad-o)
Contraction of the arteries. [G. haimas (haimad-), a stream of blood, + stenosis, a narrowing]

hemadsorption (he′mad-sorp-shun, hem′ad-)
A phenomenon manifested by an agent or substance adhering to or being adsorbed on the surface of a red blood cell.

hemafacient (he-ma-fa′she-ent, hem-a-)
SYN: hemopoietic.

hemagglutination (he-ma-gloo′ti-na′shun)
The agglutination of red blood cells; may be immune as a result of specific antibody either for red blood cell antigens per se or other antigens which coat the red blood cells, or may be nonimmune as in h. caused by viruses or other microbes. SYN: hemoagglutination. passive h. a kind of passive agglutination in which erythrocytes, usually modified by mild treatment with tannic acid or other chemicals, are used to adsorb soluble antigen onto their surface, and which then agglutinate in the presence of antiserum specific for the adsorbed antigen. SYN: indirect h. test. reverse passive h. a diagnostic technique for virus infection using agglutination by viruses of red blood cells that previously have been coated with antibody specific to the virus. viral h. the nonimmune agglutination of suspended red blood cells by certain of a wide range of otherwise unrelated viruses, usually by the virion itself but in some instances by products of viral growth ( e.g., subunits), the species of erythrocyte agglutinated differing with the different viruses. SEE ALSO: h. inhibition.

hemagglutinin (he′ma-gloo′ti-nin, hem-)
A substance, antibody or other, that causes hemagglutination. SYN: hemoagglutinin.

hemagogic (he-ma-goj′ik, hem-a-)
Promoting a flow of blood.

hemal (he′mal)
1. Relating to the blood or blood vessels. 2. Referring to the ventral side of the vertebral bodies or their precursors, where the heart and great vessels are located, as opposed to neural (2). [G. haima, blood]

hemalum (he-mal′um, hem-)
A solution of hematoxylin and alum used as a nuclear stain in histology, especially with eosin as a counterstain.

hemamebiasis (he′ma-me-bi′a-sis, hem′a-)
Any infection with ameboid forms of parasites in red blood cells, as in malaria.

hemanalysis (he-ma-nal′i-sis, hem-)
Analysis of the blood; an examination of blood, especially with reference to chemical methods. [G. haima, blood, + analysis]

hemangiectasis, hemangiectasia (he-man-je-ek′tasis, hem-an-; -ek-ta′ze-a)
Dilation of blood vessels. [G. haima, blood, + angeion, vessel, + ektasis, a stretching]

hemangio-
The blood vessels. [G. haima, blood, + angeion, vessel]

hemangioblast (he-man′je-o-blast)
A primitive embryonic cell of mesodermal origin producing cells from which are derived vascular endothelium, reticuloendothelial elements, and blood-forming cells of all types. [hemangio- + G. blastos, germ]

hemangioblastoma (he-man′je-o-blas-to′ma)
A benign neoplasm frequently arising in the cerebellum composed of capillary vessel–forming endothelial cells and stromal cells; a slowly growing tumor that affects, primarily, middle-aged individuals; increased incidence in von Hippel-Lindau disease. SYN: angioblastoma, Lindau tumor.

hemangioendothelioblastoma (he-man′je-o-en-do-the′-le-o-blasto′ma)
Hemangioendothelioma in which the endothelial cells seem to be especially immature forms. [hemangio- + endothelium + G. blastos, germ, + -oma, tumor]

hemangioendothelioma (he-man′je-o-en-do-the-le-o′ma)
A neoplasm derived from blood vessels, characterized by numerous prominent endothelial cells that occur singly, in aggregates, and as the lining of congeries of vascular tubes or channels; in the elderly, may be malignant (angiosarcoma or hemangiosarcoma), but in children are benign and probably represent a growing stage of capillary hemangioma. [hemangio- + endothelium + G. -oma, tumor] h. tuberosum multiplex an eruption of pinkish papules, caused by hyperplasia of the endothelium of the superficial blood vessels.

hemangiofibroma (he-man′je-o-fi-bro′ma)
A hemangioma with an abundant fibrous tissue framework. juvenile h. SYN: juvenile angiofibroma.

hemangioma (he-man′je-o′ma)
A congenital anomaly, in which proliferation of blood vessels leads to a mass that resembles a neoplasm; it can occur anywhere in the body but is most frequently noticed in the skin and subcutaneous tissues; most hemangiomas undergo spontaneouos regression. SEE ALSO: nevus. [hemangio- + G. -oma, tumor] capillary h. an overgrowth of capillary blood vessels, seen most commonly in the skin, at or soon after birth, as a soft bright red to purple nodule or plaque that usually disappears by the fifth year. The most common type of h.. SYN: capillary angioma, capillary h. of infancy, nevus vascularis, nevus vasculosus, superficial angioma. capillary h. of infancy SYN: capillary h.. cavernous h. old term for deep cutaneous h. that manifests spontaneous involution. Also used incorrectly for venous malformation. lobular capillary h. SYN: pyogenic granuloma. racemose h. SYN: cirsoid aneurysm. sclerosing h. 1. a benign lung or bronchial lesion, often subpleural, sometimes multiple, which forms hyalinized connective tissue. 2. SYN: dermatofibroma. senile h. red papules caused by weakening of dermal capillary walls, that do not blanch on pressure, seen mostly in persons over 30 years of age. SYN: cherry angioma, De Morgan spots. spider h. SYN: spider angioma. strawberry h. hyperproliferation of immature capillary vessels, usually on the head and neck, present at birth or within the first 2–3 months postnatally, which commonly regresses without scar formation. verrucous h. incorrect term for cutaneous vascular malformation comprised of abnormal capillaries and lymphatics.

hemangiomatosis (he-man′je-o-ma-to′sis)
A condition in which there are numerous hemangiomas.

hemangiopericytoma (he-man′je-o-per′i-si-to′ma)
An uncommon vascular, usually benign, neoplasm composed of round and spindle cells that are derived from the pericytes and surround endothelium-lined vessels; malignant hemangiopericytomas are difficult to distinguish microscopically from the benign. [hemangio- + pericyte + G. -oma, tumor]

hemangiosarcoma (he-man′je-o-sar-ko′ma)
A rare malignant neoplasm characterized by rapidly proliferating, extensively infiltrating, anaplastic cells derived from blood vessels and lining irregular blood-filled or lumpy spaces.

hemapheic (he-ma-fe′ik, hem-a-)
Pertaining to or containing hemaphein.

hemaphein (he-ma-fe′in, hem-a-)
A brown pathologic pigment derived from hemoglobin; said to be a combination of indican and urobilin. [G. haima, blood, + phaios, dusky]

hemapheism (he-ma-fe′izm, hem-a-)
The presence of hemaphein in the blood plasma and urine.

hemarthrosis (he′mar-thro′sis, hem′ar-)
Blood in a joint. [G. haima, blood, + arthron, joint]

hemastrontium (he-ma-stron′she-um, hem-a-)
A stain made by adding strontium chloride to a solution of hematein and aluminum chloride in citric acid and alcohol; used in histology.

hemat-
Blood. SEE ALSO: hem-, hemato-, hemo-. [G. haima (haimat-)]

hematachometer (he′ma-ta-kom′e-ter, hem′a-)
SYN: hemotachometer.

hematapostema (he′mat-a-pos-te′ma, hem′at-)
An abscess into which blood has effused. [hemat- + G. apostema, abscess]

hematein (he-ma-te′in, hem-a)
An oxidation product of hematoxylin. Baker acid h. an acidic solution of oxidized hematoxylin used on frozen sections for staining phospholipids.

hematemesis (he-ma-tem′e-sis, hem-a-)
Vomiting of blood. SYN: vomitus cruentes. [hemat- + G. emesis, vomiting]

hematencephalon (he′mat-en-sef′a-lon, hem′at-)
SYN: cerebral hemorrhage. [hemat- + G. enkephalos, brain]

hematherapy (he′ma-thar′a-pe, hem′a-)
SYN: hemotherapy.

hematherm (he′ma-therm, hem′a-)
SYN: homeotherm. [G. haima, blood, + thermos, warm]

hemathermal (he-ma-ther′mal, hem-a-)
SYN: homeothermic. [G. haima, blood, + thermos, warm]

hemathermous (he-ma-ther′mus, hem-a-)
SYN: homeothermic.

hemathorax (he-ma-thor′aks, hem-a-)
SYN: hemothorax.

hematic (he-mat′ik)
1. Relating to blood. SYN: hemic. 2. SYN: hematinic (2) .

hematid (he′ma-tid, hem′a-)
1. Obsolete term for a red blood cell. 2. Obsolete term for a cutaneous eruption presumed to be caused by a substance in the circulating blood. [hemat- + -id]

hematidrosis (he′mat-i-dro′sis, hem′at-)
Excretion of blood or blood pigment in the sweat; an extremely rare disorder. [hemat- + G. hidros, sweat]

hematimeter (he-ma-tim′e-ter, hem-a-)
SYN: hemocytometer.

hematin (he′ma-tin, hem′a-)
Heme in which the iron is Fe(III) (Fe3+); the prosthetic group of methemoglobin. SYN: ferriheme, hematosin, hydroxyhemin, oxyheme, oxyhemochromogen, phenodin. h. chloride SYN: hemin. reduced h. SYN: heme.

hematinemia (he′ma-ti-ne′me-a, hem′a-)
The presence of heme in the circulating blood. [hematin + G. haima, blood]




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