| avian | (adjective) pertaining to or characteristic of birds | - |
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| avid | (adjective) (often followed by `for') ardently or excessively desirous | Synonyms: devouring, esurient, greedy |
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| (adjective) marked by active interest and enthusiasm | Synonyms: zealous |
| avifaunal | (adjective) of or relating to birds of a particular region or period | Synonyms: avifaunistic |
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| avifaunistic | (adjective) of or relating to birds of a particular region or period | Synonyms: avifaunal |
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| avionic | (adjective) of or relating to avionics | - |
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| avirulent | (adjective) not virulent; unable to produce disease | - |
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| avitaminotic | (adjective) of or relating to or characteristic of avitaminosis | - |
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