Etymology

psoas

pso·as
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Today it means: Either of two muscles, the psoas major and psoas minor, involved in flexion of the trunk. Full definition →

Ancient Greek ψόᾱς
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The story

  1. Ancient Greek · derived fromψόᾱς“of the muscle of the loins”
  2. English todaypsoas

From Ancient Greek ψόᾱς (psóās, “of the muscle of the loins”), genitive singular of ψόα (psóa).

Etymology from Wiktionary, CC BY-SA 4.0.