| heterosaccharide | A glycoside in which a sugar group is attached to a nonsugar group; e.g., amygdalin. (05 Mar 2000) |
|---|---|
| heteroscedasticity | Non-constancy of the variance of a measure over the levels of the factor under study. Origin: hetero + G. Skedastikos, pertaining to scattering, fr. Skedannumi, to scatter (05 Mar 2000) |
| heterosexual | A person sexually attracted to persons of the opposite sex. The word straight has become synonymous with heterosexual. Heterosexual can also be an adjective. (12 Dec 1998) |
| heterosexuality | Sexuality directed toward someone of the opposite sex. (12 Dec 1998) |
| heteroside | A compound containing two or more different carbohydrate residues that are covalently linked to a noncarbohydrate moiety. (05 Mar 2000) |
| heterosis | <biology> The observation that in some circumstances, the heterozygotes in a population have higher fitness than the homozygotes, for example they grow better, are better able to survive, and/or are more fertile than the homozygotes. The effect of heterosis can also apply to hybrids (thus hybrid vigor). (09 Oct 1997) |
| heterosmia | Incorrect recognition of odours. Synonym: heterosmia. Origin: G. Allotrios, foreign, + osme, smell (05 Mar 2000) |
| heterosomati | <zoology> An order of fishes, comprising the flounders, halibut, sole, etc, having the body and head asymmetrical, with both eyes on one side. Synonym: Heterosomata, Heterosomi. Origin: NL, fr. Gr. Other +, body. Source: Websters Dictionary (01 Mar 1998) |
| heterosome | In genetics, the chromosome pair that is different in the two sexes. See: sex chromosomes. Origin: hetero-+ G. Soma, body (05 Mar 2000) |
| heterospecific | Heterologous, as pertains to grafts. (05 Mar 2000) |
| heterospecific antibody | <immunology> Artificially produced antibody in which the two antigen binding sites are for different antigens. (18 Nov 1997) |
| heterospecific graft | <surgery> A surgical graft of tissue from one species onto or into individuals of unlike species, genus or family. Also know as a heteroplastic graft. See: xenotransplantation. (11 May 1997) |
| heterosporous | <plant biology> Producing separate male and female spores. Compare: homosporous. (09 Oct 1997) |
| heterospory | <plant biology> Condition in vascular plants where the spores are of two different sizes, the smaller producing male prothalli, the larger female prothalli. (18 Nov 1997) |
| heterostyled | <botany> Having styles of two or more distinct forms or lengths. Source: Websters Dictionary (01 Mar 1998) |