10じゅう円えんハゲじゅうえんはげMeanings1nouncoin-sized bald spot; 10-yen baldnesscolloquial›Colloquial term for a small, round bald patch, likened to the size of a 10-yen coin. Often used for alopecia areata (円形脱毛症).See also: 円形脱毛症最さい近きん、頭