Ax·il·la n.; pl. Axillae Anat. The armpit, or the cavity beneath the junction of the arm and shoulder.
2. Bot. An axil.
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axilla
n : the hollow under the arm where it is joined to the shoulder;
"they were up to their armpits in water" [syn: armpit,
axillary cavity, axillary fossa]
[also: axillae (pl)]