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n. pl. alu·lae (-lē′)
A small joint in the middle of a bird's wing, homologous with the thumb and bearing three or four quill-like feathers. Also called bastard wing.

al′u·lar (-lər) adj.

alula, alula spuria

the freely articulated first digit of the avian hand. Called also bastard wing.

alula remiges
see remex.
References in periodicals archive ?
The postoperative radiograph revealed a complete resection of the alular bone.
19) In the case we describe, amputation of the alular bone was elected because of the limited role of this bone during flight in companion birds.