WordReference Random House Learner's Dictionary of American English © 2017
arm•pit /ˈɑrmˌpɪt/USA pronunciation   n. [countable]
  1. Anatomythe hollow place under the arm at the shoulder.

WordReference Random House Unabridged Dictionary of American English © 2017
arm•pit  (ärmpit′),USA pronunciation n. 
  1. Anatomythe hollow under the arm at the shoulder;
  • 1300–50; Middle English; see arm1, pit1

Collins Concise English Dictionary © HarperCollins Publishers::

armpit /ˈɑːmˌpɪt/ n
  1. the small depression beneath the arm where it joins the shoulder
    Technical name: axilla
  2. slang an extremely unpleasant place: the armpit of the Mediterranean

'armpit' also found in these entries:

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