A prefix or combining form relating to the chin or jawbone, used in anatomical and medical terminology.
From Latin 'genium' (chin, jawbone), ultimately from Greek 'geneion' (beard, chin). Used as a combining form in medical terms like 'genioplasty' (chin surgery).
The genio- prefix appears in surprising places—'genioglossus' is a muscle you use every time you eat or talk, yet most people never learn its name despite using it dozens of times daily.
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