| aileron | (noun) an airfoil that controls lateral motion | - |
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| archenteron | (noun) central cavity of the gastrula; becomes the intestinal or digestive cavity | - |
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| chaperon | (noun) one who accompanies and supervises a young woman or gatherings of young people | Synonyms: chaperone |
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| (verb) accompany as a chaperone | Synonyms: chaperone |
| coelenteron | (noun) the saclike body cavity of a coelenterate | - |
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| deuteron | (noun) the nucleus of deuterium; consists of one proton and one neutron; used as a bombarding particle in accelerators | - |
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| dipteron | (noun) insects having usually a single pair of functional wings (anterior pair) with the posterior pair reduced to small knobbed structures and mouth parts adapted for sucking or lapping or piercing | Synonyms: dipteran, dipterous insect, two-winged insects |
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| enteron | (noun) the alimentary canal (especially of an embryo or a coelenterate) | - |
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| ephemeron | (noun) anything short-lived, as an insect that lives only for a day in its winged form | Synonyms: ephemeral |
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| hemipteron | (noun) insects with sucking mouthparts and forewings thickened and leathery at the base; usually show incomplete metamorphosis | Synonyms: bug, hemipteran, hemipterous insect |
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| heron | (noun) grey or white wading bird with long neck and long legs and (usually) long bill | - |
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| hymenopteron | (noun) insects having two pairs of membranous wings and an ovipositor specialized for stinging or piercing | Synonyms: hymenopter, hymenopteran, hymenopterous insect |
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| hyperon | (noun) any baryon that is not a nucleon; unstable particle with mass greater than a neutron | - |
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| interferon | (noun) an antiviral protein produced by cells that have been invaded by a virus; inhibits replication of the virus | - |
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| lepidopteron | (noun) insect that in the adult state has four wings more or less covered with tiny scales | Synonyms: lepidopteran, lepidopterous insect |
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| moneron | (noun) organisms that typically reproduce by asexual budding or fission and whose nutritional mode is absorption or photosynthesis or chemosynthesis | Synonyms: moneran |
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| neuropteron | (noun) insect having biting mouthparts and four large membranous wings with netlike veins | Synonyms: neuropteran, neuropterous insect |
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| operon | (noun) a segment of DNA containing adjacent genes including structural genes and an operator gene and a regulatory gene | - |
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| orthopteron | (noun) any of various insects having leathery forewings and membranous hind wings and chewing mouthparts | Synonyms: orthopteran, orthopterous insect |
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| thysanopteron | (noun) an insect of the order Thysanoptera | Synonyms: thysanopter, thysanopterous insect |
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| trichopteron | (noun) caddis fly | Synonyms: trichopteran, trichopterous insect |
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