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ge·nio·glos·sus | \ -ˈgläs-əs 
, -ˈglȯs- \
, -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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