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quadratus

quadratus Anat.
  (kwəˈdreɪtəs)
  [L.: see quadrate n.1 and a.]
  A quadrate muscle. quadratus femoris, quadratus lumborum, etc. (see quadrate a. 1 c).

1727–41 Chambers Cycl., Quadratus..a name applied to several muscles, in respect of their square figure; as the palmaris, and pronators. 1756 Winslow Anat. (ed. 4) I. 211 A tendon..inserted between the Gemelli and Quadratus. 1843 J. G. Wilkinson Swedenborg's Anim. Kingd. I. ii. 60 Some of the before mentioned muscles: these are the triangulares and quadratus. 1870 Rolleston Anim. Life 3 The two psoas muscles and the quadratus lumborum.

Oxford English Dictionary

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