All Words Glossary

Glossary of Biological Terms
beginning with letter H
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haustorium
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noun (haustoria)
  1. A root of a parasitic plant modified to take nourishment from its host.
heliotropic
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adjective
  1. Exhibiting heliotropism
heliotropism
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noun
  1. The property of some plants of turning under the influence of light; either positively (towards the light) or negatively (away from the light)
helminthoid
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adjective
  1. (medicine) vermicular; wormlike
herpetology
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noun her"pe"tol"o"gy
  1. the branch of biology dealing with reptiles (Reptilia)] or amphibians.
heterogenous
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adjective
  1. (genetics) derived from a different individual or species
    1. (alternative spelling of, heterogeneous)
heterologous
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adjective
  1. Having different relationships or different elements
  2. (biology) Of, or relating to different species
  3. heterologous blood donation
histologist
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noun
  1. (biology) One who study, studies histology.
histology
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noun
  1. (biology) The study of the structure, chemical composition and function of the tissue or tissue systems of plants and animals
holotype
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noun
  1. The single physical example (or illustration) of an organism, known to be used when the taxon was formally described.
homogenous
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adjective
  1. (biology) Having the same genetic structure; exhibiting homogeny
    1. Having the same consistency and contents throughout; uniform or homogeneous
homogeny
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noun
  1. (biology) Similarity in structure, though of different function, because of genetic relationships
homonym
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noun
  1. A word that sounds or is spelled the same as another word but has a different meaning.
homotypic
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adjective
  1. (botany) literally "with the same type". In botanical nomenclature a homotypic synonym (or nomenclatural synonym) is a synonym that comes into being through a nomenclatural act
  1. when a taxon gets a new name, without being included in another taxon (of the same rank). The old name becomes a homotypic synonym of the new name.
  2. when a new name for a taxon is coined without displacing the existing name, the new name becomes a homotypic synonym.
    :The zoological equivalent is "objective synonym".
homozygous
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adjective
  1. of an organism in which both copies of a given gene have the same allele

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