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ˈal-yə-lə Noun, pl. alulae 1. A small projection on the anterior edge of the wing of modern (and some ancient) birds. ( 2. The freely moving first digit, a bird’s “thumb,” and typically bears three to five small flight feathers, with the exact number depending on the species. ( 3. The group of three to six small, rather stiff feathers growing on the first digit, pollex, or thumb of a bird’s wing. ( Syn: bastard wing, spurious wing Word origin: From New Latin, from Latin, diminutive of ala...

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