| artiodactyl | (adjective) of or relating to or belonging to mammals of the order Artiodactyla | Synonyms: artiodactylous, even-toed |
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| carbonyl | (adjective) relating to or containing the carbonyl group | Synonyms: carbonylic |
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| carboxyl | (adjective) relating to or containing the carboxyl group or carboxyl radical | Synonyms: carboxylic |
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| heterodactyl | (adjective) (of bird feet) having the first and second toes directed backward the third and fourth forward | - |
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| polydactyl | (adjective) of or relating to a person (or other vertebrate) having more than the normal number of digits | Synonyms: polydactylous |
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| zygodactyl | (adjective) (of bird feet) having the first and fourth toes directed backward the second and third forward | - |
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