NOUN (2)

1. a flat wing-shaped process or winglike part of an organism;
- Example: "the alae of the nose"
- Example: "the alae of a maple seed"
- Example: "the flat petals of a pea blossom are alae"

2. a wing of an insect;

The Collaborative International Dictionary of English v.0.48:

ala \a"la\ ([=a]"l[.a]), n.; pl. Al[ae] ([=a]"l[=e]). [L., a
   wing.] (Biol.)
   A winglike organ, or part.
   [1913 Webster]