[ sahr-tawr-ee-uhs, -tohr- ]
/ sɑrˈtɔr i əs, -ˈtoʊr- /
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noun, plural sar·to·ri·i [sahr-tawr-ee-ahy, -tohr-]. /sɑrˈtɔr iˌaɪ, -ˈtoʊr-/. Anatomy.
a long, flat, narrow muscle extending obliquely from the front of the hip to the inner side of the tibia, assisting in bending the hip or knee joint and in rotating the thigh outward: the longest muscle in humans.
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Origin of sartorius

1695–1705; <New Latin sartōrius, adj. derivative of Late Latin sartor tailor; see -tory1
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British Dictionary definitions for sartorius

/ (sɑːˈtɔːrɪəs) /

noun plural -torii (-ˈtɔːrɪˌaɪ)
anatomy a long ribbon-shaped muscle that aids in flexing the knee

Word Origin for sartorius

C18: New Latin, from sartorius musculus, literally: tailor's muscle, because it is used when one sits in the cross-legged position in which tailors traditionally sat while sewing
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