arm-pit

armpit

[ahrm-pit]
noun
the hollow under the arm at the shoulder; axilla.

Origin:
1300–50; Middle English; see arm1, pit1

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World English Dictionary
armpit (ˈɑːmˌpɪt)
 
n
1.  Technical name: axilla the small depression beneath the arm where it joins the shoulderRelated: axillary
2.  slang an extremely unpleasant place: the armpit of the Mediterranean
 
Related: axillary

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

armpit
c.1400, from arm (1) + pit. Arm-hole (late 14c.) was used in this sense but was obsolete by 18c. Colloquial armpit of the nation for any locale regarded as ugly and disgusting was in use by 1965
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

armpit arm·pit (ärm'pĭt')
n.
The hollow under the upper part of the arm below the shoulder joint, bounded by the pectoralis major, the latissimus dorsi, the anterior serratus muscles, and the humerus, and containing the axillary artery and vein, the infraclavicular part of the brachial plexus, lymph nodes and vessels, and areolar tissue. Also called axilla, axillary fossa.

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