Source : Webster's Revised Unabridged Dictionary (1913)

Alula \Al"u*la\, n. [NL., dim. of L. ala a wing.] (Zo["o]l.)
   A false or bastard wing. See under {Bastard}.

Source : WordNet®

alula
     n 1: scale-like structure between the base of the wing and the
          halter of a two-winged fly [syn: {calypter}]
     2: tuft of small stiff feathers on the first digit of a bird's
        wing [syn: {bastard wing}, {spurious wing}]
     [also: {alulae} (pl)]