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Definition of: alula
(al′yə·lə) noun plural ·lae (lē)
1. Ornithol. A tuft of feathers on that part of a bird's wing homologous to the thumb. Also called bastard wing.
2. Entomol. A membranous lobe separated from the wing base in certain flies. [<NL, dim. of L ala wing]
—al′u·lar adjective
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