serratus

noun
ser·​ra·​tus | \ se-ˈrāt-əs How to pronounce serratus (audio) \
plural serrati\ -​ˈrā-​ˌtī How to pronounce serrati (audio) \

Medical Definition of serratus

: any of three muscles of the thorax that have complex origins but arise chiefly from the ribs or vertebrae:

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