genioglossus

noun
ge·nio·glos·sus | \ -ˈgläs-əs , -ˈglȯs- \
plural genioglossi\-ˌī \

Medical Definition of genioglossus 

: a fan-shaped muscle that arises from the superior mental spine, inserts on the hyoid bone and into the tongue, and serves to advance and retract and also to depress the tongue

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