A medical condition in which a person is born without lips or with severely underdeveloped lips.
From Greek 'a-' (without) plus 'cheilos' (lip) with the medical suffix '-ia' denoting a condition or disease state, creating a clinical term for lip absence.
Acheilia is rare but documented in medical history, and studying birth defects like this helped doctors understand how embryos develop—every unusual condition teaches us something about normal development.
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