| n. | 1. | (Zool.) A false or bastard wing. See under Bastard. |
| Noun | 1. | alula - scale-like structure between the base of the wing and the halter of a two-winged fly Synonyms: calypter |
| 2. | alula - tuft of small stiff feathers on the first digit of a bird's wing Synonyms: bastard wing, spurious wing |