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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
psoas is a noun meaning "either of two muscles of the abdomen and pelvis that flex the trunk and rotate the thigh". It carries one recorded sense.
either of two muscles of the abdomen and pelvis that flex the trunk and rotate the thigh
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for psoas come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.