The Collaborative International Dictionary of English v.0.48:

Axillaries \Ax"il*la*ries\ ([a^]ks"[i^]l*l[asl]*r[i^]z),
Axillars \Ax"il*lars\ ([a^]ks"[i^]l*l[~e]rz), n. pl. (Zool.)
   Feathers connecting the under surface of the wing and the
   body, and concealed by the closed wing.
   [1913 Webster]