玄人

*/kuroputo/ → */kurofuto/ → /kurouto/

Compound of 玄(くろ) (kuro, “deep, profound”) + 人(うと) (uto, “person”).

The term 人 (hito, “person”) appears in various older compounds with a root form of 人 (*puto → *buto → *udo, *puto → *futo → *uto). This form is never seen in isolation, and it often undergoes further phonetic changes to combine with preceding vowels. Compare the formation of 仲人 (nakōdo), from naka + udo; 旅人 (tabiudo), from tabi + udo; 素人 (shirōto), from shiro + uto.

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玄(くろ)人(うと) or 玄(くろ)人(と) • (kurōto or kuroto) 

1. professional, master

• 素人(しろうと) (shirōto)