A condition where hair turns gray or white on only one side of the head or body, creating a striking two-toned appearance.
From Greek 'hemi-' (half) plus Latin 'canities' (grayness, from 'canus' meaning gray). This dermatological term emerged in the 1800s to describe rare but documented asymmetrical graying.
Hemicanities sounds like a comic book superpower—people with this condition literally have the Cruella de Vil look naturally, with pigment loss on one side probably caused by uneven distribution of the genes controlling melanin production.
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