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psoas

[soh-uh s] /ˈsoʊ əs/
noun, plural psoai
[soh-ahy] /ˈsoʊ aɪ/ (Show IPA),
psoae
[soh-ee] /ˈsoʊ i/ (Show IPA).
Anatomy
1.
either of two muscles, one on each side of the loin, extending internally from the sides of the spinal column to the upper end of the femur, which assist in flexing and rotating the thigh and flexing the trunk on the pelvis.
Origin
1675-1685
1675-85; < Neo-Latin < Greek psóās, accusative plural (taken as nominative singular) of psóa a muscle of the loins
Related forms
psoatic
[soh-at-ik] /soʊˈæt ɪk/ (Show IPA),
adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for psoatic

psoas

/ˈsəʊəs/
noun
1.
either of two muscles of the loins that aid in flexing and rotating the thigh
Word Origin
C17: from New Latin, from Greek psoai (pl)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for psoatic

psoas

n.

1680s, from Greek psoa (plural psoai) "muscles of the loins." Related: Psoitis.

Gk. [psoas], the gen. of the feminine noun [psoa], was mistaken by the French anatomist Jean Riolan (1577-1657) for the nom. of a (nonexistent) masculine noun. It was he who introduced this erroneous form into anatomy." [Klein]

Online Etymology Dictionary, © 2010 Douglas Harper
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