From The Collaborative International Dictionary of English v.0.48 :
Axillary \Ax"il*la*ry\ ([a^]ks"[i^]l*l[asl]*r[y^]), a. [See
Axil.]
1. (Anat.) Of or pertaining to the axilla or armpit; as,
axillary gland, artery, nerve.
[1913 Webster]
2. (Bot.) Situated in, or rising from, an axil; of or
pertaining to an axil. "Axillary buds." --Gray.
[1913 Webster]
From WordNet (r) 3.0 (2006) :
axillary
adj 1: of or relating to the axil [syn: axillary, alar]
2: of or relating to the armpit; "axillary gland"