Why is the ninth month called September?
"wing-like," c.1840; "of or pertaining to wings," 1847, from Latin alaris, from ala "wing, armpit, wing of an army" (source of Spanish ala, French aile), from *axla, originally "joint of the wing or arm;" from PIE *aks- (see axis).
alar a·lar (ā'lər)
Resembling, containing, or composed of wings or alae; axillary.
Relating to the ala of such structures as the nose, sphenoid bone, and sacrum.