A muscle in the floor of the mouth that connects the chin bone to the hyoid bone and helps move the tongue downward and backward.
From Greek 'geneion' (chin) + 'hyoid' + 'glossus' (tongue), naming the specific muscle that links all three structures; this anatomical term was systematized during Renaissance anatomy studies.
Your geniohyoglossus muscle is actually pulling your tongue down right now as you read—it's one of the muscles controlling speech and swallowing, and it's also one of the muscles that can partially block your airway during sleep apnea!
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