Of or relating to both the chin and the tongue, especially the genioglossus muscle that connects the lower jawbone to the tongue.
From 'genio-' (chin, from Latin 'genium') + 'glossal' (from Greek 'glossa' meaning tongue), combined with '-al' (relating to).
The genioglossus muscle is one reason sleep apnea sometimes happens—when you're deeply relaxed, this muscle relaxes too, potentially collapsing your airway, which is why some sleep apnea treatments target it specifically.
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