anorthogenesis n. [Gr. an, without; orthos, straight; genesis, beginning] Adaptive changes of evolutionary significance based on preadaptations; zigzag evolution.
anosmatic a. [Gr. an, without; osme, smell] Lacking or impairment of the sense of smell.
anoxybiont n. [Gr. an, without; oxys, sharp; bios, life] An organism incapable of using oxygen as opposed to one that is aerobic.
ansa n. [L. ansa, handle] A loop or loop-like structure.
ansiform a. [L. ansa, handle; forma, shape] Looped, or looplike in shape.
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