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Medical Dictionary - Dictionary of Medicine and Human Biology


Medical Dictionary


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heteroploidy (het′er-o-ploy′de)
The state of a cell possessing some number of complete haploid sets other than the normal. [hetero- + G. ploides, in form]

heteropolysaccharide (het′er-o-pol-e-sak′a-rid)
A polysaccharide composed of two or more different types of monosaccharides. Cf.:glycan, homoglycan. SYN: heteroglycan.

heteroproteose (het′er-o-pro′te-os)
See primary proteose.

heteropyknosis (het′er-o-pik-no′sis)
Any state of variable density or condensation, usually in different chromosomes or between different regions of the same chromosome; a region may be attentuated (negative h) or accentuated (positive h). [hetero- + G. pyknos, dense]

heteropyknotic (het′er-o-pik-not′ik)
Relating to or characterized by heteropyknosis.

heteroreceptor (het′er-o-re-sep′ter)
A site on a neuron that binds a modulatory neuroregulator other than that released by the neuron. [hetero- + receptor]

heterosaccharide (het′er-o-sak′a-rid)
A glycoside in which a sugar group is attached to a nonsugar group; e.g., amygdalin.

heteroscedasticity (het′er-o-sked-as-tis′i-te)
Non-constancy of the variance of a measure over the levels of the factor under study. [hetero + G. skedastikos, pertaining to scattering, fr. skedannumi, to scatter]

heterosexual (het′er-o-sek′shoo-al)
1. A person whose sexual orientation is toward persons of the opposite sex. 2. Relating to or characteristic of heterosexuality. 3. One whose interests and behavior are characteristic of heterosexuality.

heterosexuality (het′er-o-sek-shoo-al′i-te)
Erotic attraction, predisposition, or activity, including sexual congress between persons of the opposite sex.

heteroside (het′er-o-sid)
A compound containing two or more different carbohydrate residues that are covalently linked to a noncarbohydrate moiety.

heterosis (het-er-o′sis)
The beneficial effect on the phenotype of crossing (hybridization) upon growth, vigor, and physical or mental qualities in a strain of plants or in animal stock, as measured by the difference between the midparent mean phenotype and that of F1; also referred to as hybrid vigor. [hetero- + -osis, condition]

heterosmia (het′er-os′me-a)
SYN: allotriosmia.

heterosome (het′er-o-som)
In genetics, the chromosome pair that is different in the two sexes. See sex chromosomes, under chromosome. [hetero- + G. soma, body]

heterospecific (het′er-o-spe-sif′ik)
Heterologous, as pertains to grafts.

heterosuggestion (het′er-o-sug-jes′chun)
A rarely used term for hypnotic suggestion received from another person; opposed to autosuggestion.

heterotaxia (het′er-o-taks′e-a)
Abnormal arrangement of organs or parts of the body in relation to each other. SYN: heterotaxis, heterotaxy. [hetero- + G. taxis, arrangement] cardiac h. dextrocardia.

heterotaxic (het-er-o-taks′ik)
Abnormally placed or arranged.

heterotaxis, heterotaxy (het-er-o-taks′is, het′er-o-taks-e)
SYN: heterotaxia.

heterothallic (het′er-o-thal′ik)
In fungi, denoting a kind of sexual reproduction in which a sexual spore is produced only by fusion with a nucleus of another mating type. Cf.:homothallic. [hetero- + G. thallos, a young shoot]

heterotherm (het′er-o-therm)
A heterothermic animal.

heterothermic (het′er-o-ther′mik)
Having partial regulation of body temperature; between poikilothermic and homeothermic.

heterotic (het-er-ot′ik)
Relating to heterosis.

heterotonia (het′er-o-to′ne-a)
Abnormality or variation in tension or tonus. [hetero- + G. tonos, tension]

heterotopia (het-er-o-to′pe-a)
1. SYN: ectopia. 2. In neuropathology, displacement of gray matter, typically into the deep cerebral white matter. [hetero- + G. topos, place] h. maculae SYN: ectopia maculae.

heterotopic (het-er-o-top′ik)
1. SYN: ectopic (1) . 2. Relating to heterotopia (2). [hetero- + topos, place, + suffix -ic, pertaining to]

heterotopous (het-er-ot′o-pus)
Heterotopic, especially in reference to teratomas composed of tissues that are out of place in the region where found.

heterotransplantation (het′er-o-tranz-plan-ta′shun)
Transfer of a heterograft (xenograft).

heterotrichosis (het′er-o-tri-ko′sis)
A condition characterized by hair growth of variegated color. [hetero- + G. trichosis, growth of hair]

heterotroph (het′er-o-trof, -trof)
A microorganism that obtains its carbon, as well as its energy, from organic compounds. SEE ALSO: autotroph. [hetero- + G. trophe, nourishment]

heterotrophic (het′er-o-tro-fik)
1. Relating to or exhibiting the properties of heterotrophy. 2. Relating to a heterotroph.

heterotrophy (het′er-o-tro-fe)
The ability or requirement to synthesize all metabolites from organic compounds.

heterotropia, heterotropy (het′er-o-tro′pe-a, het-er-ot′ro-pe)
SYN: strabismus. [hetero- + G. trope, a turning]

heterotypic (het′er-o-tip′ik)
Of a different or unusual type or form.

heteroxanthine (het′er-o-zan′thin)
7-Methylxanthine;one of the alloxuric bases in urine, representing end products of purine metabolism.

heteroxenous (het-er-oks′e-nus)
SYN: digenetic (1) . [hetero- + G. xenos, stranger]

heterozoic (het-er-o-zo′ik)
Relating to another animal or another species of animal. [hetero- + G. zoikos, relating to an animal]

heterozygosity, heterozygosis (het′er-o-zi-gos′i-te, -zi-go′sis)
The state of being heterozygous. [hetero- + G. zygon, a yoke]

heterozygote (het′er-o-zi′got)
A heterozygous individual. [hetero- + G. zygotos, yoked] compound h. in medical genetics, the presence of two different mutant alleles at the same loci. SYN: genetic compound. manifesting h. an organism heterozygous for what is ordinarily a recessive condition which, as a result of special mechanisms (such as lyonization, allelic exclusion, or a deletion in the homologous chromosome), has phenotypic manifestations. SYN: manifesting carrier.

heterozygous (het′er-o-zi′gus)
Having different alleles at one locus regarding a specific character; heterotic. doubly h. in the analysis of linkage between two loci, denoting that genotype in which a parent is h. at both loci, the state that on average contains the maximum information about the linkage.

Heubner
Johann O.L., German pediatrician, 1843–1926. See artery of H., H. arteritis.

Heurenius
Johannes. See van Horne.

Heuser
Chester H., U.S. embryologist, 1885–1965. See H. membrane.

HEV
Abbreviation for hepatitis E virus.

hexa-, hex-
Prefix denoting six. [G. hex]

hexacanth (hek′sa-kanth)
The motile six-hooked first-stage larva of cyclophyllidean cestodes; it emerges from the egg and actively claws its way through the intermediate host's intestine prior to development into the next larval stage; e.g., the h. of Taenia saginata, which penetrates the intestine of a cow that ingested the egg, then forms a cysticercus in the muscles of the intermediate host. SYN: oncosphere. [hexa- + G. akantha, hook or thorn]

hexachlorocyclohexane (hek-sa-klo′ro-si-klo-hek′san)
SYN: gamma benzene hexachloride.

hexachlorophane (hek-sa-klo′ro-fan)
SYN: hexachlorophene.

hexachlorophene (hek-sa-klo′ro-fen)
An antibacterial; formerly widely used in soaps and detergents to inhibit bacterial growth; excessive use causes neurologic lesions; currently limited use. SYN: hexachlorophane.

hexacosanoic acid (heks′a-ko′san-o-ik)
Systemic name for cerotinic acid.

hexacosanol (heks-a-ko′sa-nol)
See ceryl.

hexacosyl (heks-a-ko′sil)
SYN: ceryl.

hexad (heks′ad)
A sexivalent element or radical.

hexadactyly, hexadactylism (hek′sa-dak′ti-le, -lizm)
The presence of six fingers or six toes on one or both hands or feet. [hexa- + G. daktylos, finger]

hexadecanoic acid (hek′sa-dek-a-no′ik)
SYN: palmitic acid.

1-hexadecanol (hek-sa-dek′a-nol)
SYN: cetyl alcohol.

hexafluorenium bromide (hek′sa-floo-ren′e-um)
A potentiator for succinylcholine in anesthesiology by producing a mild nondepolarizing neuromuscular blockade; also inhibits plasma cholinesterase.

hexamer (hek′sa-mer)
1. A group of six protein subunits that form a capsomere on the surface of an icosohedral virus. 2. A complex or compound containing six subunits or moieties ( e.g., a protein complex with six polypeptide chains or an oligopeptide with six amino acid residues). [hexa- + G. meros, part]

hexameric (heks′a-mer-ik)
Containing six subunits or moieties.

hexametazime (HMPAO)
A lipophilic substance that readily crosses the blood-brain barrier; combined with 99mTc to produce a radiopharmaceutical for SPECT imaging or cerebral blood flow estimates. SYN: hexamethylpropyleneamine oxime.

hexamethylpropyleneamine oxime (heks-a-meth′il-pro′pi-len- a-men oks′em)
SYN: hexametazime.

hexamidine isethionate (hek-sam′i-den)
A topical antiseptic.

hexamine (hek′sa-men)
SYN: methenamine.

hexane (hek′san)
A saturated hydrocarbon, C6H14, of the paraffin series (typically n-h., CH3&cbond;(CH2)4&cbond;CH3).

hexanoate (hek′sa-no-at)
SYN: caproylate.

hexanoyl (hek′sa-no-il)
SYN: caproyl.

hexapeptide (heks′a-pep′tid)
A peptide containing six amino acid residues.

hexaploidy (heks′a-ploy-de)
See polyploidy.

Hexapoda (hek-sap′o-da)
SYN: Insecta. [hexa- + G. pous, foot]

hexestrol (hek-ses′trol)
A synthetic meso-compound with estrogenic activity.

hexitol (heks′i-tol)
The polyol (sugar alcohol) obtained on the reduction of a hexose ( e.g., d-sorbitol).

hexokinase (heks-o-ki′nas)
A phosphotransferase present in yeast, muscle, brain, and other tissues that catalyzes the ATP-dependent phosphorylation of d-glucose and other hexoses to form d-glucose 6-phosphate (or other hexose 6-phosphates); the first step in glycolysis; a deficiency of h. can result in hemolytic anemia and impaired glycolysis.




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