genioglossus

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ge·ni·o·glos·sus

 (jē′nē-ō-glŏs′əs)
n. pl. ge·ni·o·glos·si (-ī′)
Either of a pair of muscles that connect the jaw and tongue and that depress and protrude the tongue.

[New Latin genioglōssus : Greek geneion, chin; see genial2 + Greek glōssa, tongue.]