Source : Webster's Revised Unabridged Dictionary (1913)

Ala \A"la\, n.; pl. {Al[ae]}. [L., a wing.] (Biol.)
   A winglike organ, or part.

Source : WordNet®

ala
     n 1: a flat wing-shaped process or winglike part of an organism;
          "the alae of the nose"; "the alae of a maple seed"; "the
          flat petals of a pea blossom are alae"
     2: a wing of an insect
     [also: {alae} (pl)]