Melanism

имя существительное меланизм (преобладание тёмных пигментов) Синоним(ы): freckle, mole, birthmark, nevus

Большой англо-русский словарь

Melanism

noun 1. an increased amount of black or nearly black pigmentation (as of skin, feathers, or hair) of an individual or kind of organism — compare industrial melanism 2. intense human pigmentation of the skin, eyes, and hair • melanistic adjective

Merriam-Webster's Collegiate Dictionary