| holocaust | (noun) an act of mass destruction and loss of life (especially in war or by fire) | - |
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| holocephalan | (noun) fish with high compressed head and a body tapering off into a long tail | Synonyms: holocephalian |
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| holocephalian | (noun) fish with high compressed head and a body tapering off into a long tail | Synonyms: holocephalan |
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| hologram | (noun) the intermediate photograph (or photographic record) that contains information for reproducing a three-dimensional image by holography | Synonyms: holograph |
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| holograph | (noun) the intermediate photograph (or photographic record) that contains information for reproducing a three-dimensional image by holography | Synonyms: hologram |
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| (noun) handwritten book or document | Synonyms: manuscript |
| holography | (noun) the branch of optics that deals with the use of coherent light from a laser in order to make a hologram that can then be used to create a three-dimensional image | - |
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| holometabola | (noun) insects that undergo complete metamorphosis | Synonyms: metabola |
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| holometabolism | (noun) complete metamorphosis in insects | Synonyms: holometaboly |
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| holometaboly | (noun) complete metamorphosis in insects | Synonyms: holometabolism |
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| holonym | (noun) a word that names the whole of which a given word is a part | Synonyms: whole name |
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| holonymy | (noun) the semantic relation that holds between a whole and its parts | Synonyms: whole to part relation |
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| holophyte | (noun) an organism that produces its own food by photosynthesis | - |
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| holothurian | (noun) echinoderm having a flexible sausage-shaped body, tentacles surrounding the mouth and tube feet; free-living mud feeders | Synonyms: sea cucumber |
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| holotype | (noun) the original specimen from which the description of a new species is made | Synonyms: type specimen |
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