noun, plural axillae [ak-sil-ee] .
Anatomy. the armpit.
Ornithology. the corresponding region under the wing of a bird.
Botany. an axil.

1610–20; < Latin Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
axilla (ækˈsɪlə)
n , pl -lae
1.  the technical name for the armpit
2.  the area on the undersurface of a bird's wing corresponding to the armpit
[C17: from Latin: armpit]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

axilla ax·il·la (āk-sĭl'ə)
n. pl. ax·il·lae (-sĭl'ē)
See armpit.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
On either side of the thorax, from the axilla downward, the flattened external surfaces of the ribs may be defined.
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