hypopigmentation

noun

The act of abnormal reduction in pigmentation

Wiktionary

noun

Etymology: Etymology tree Proto-Indo-European *upó Ancient Greek ῠ̔πό (hŭpó) Ancient Greek ὑπο- (hupo-)der. English hypo- English pigment Proto-Indo-European *-tis Proto-Indo-European *-Hō Proto-Indo-European *-tiHō Proto-Italic *-tiō Latin -tiō Latin -ātiōlbor. Old French -ationbor. Middle English -acioun English -ation English pigmentation English hypopigmentation From hypo- + pigmentation.

Abnormally reduced pigmentation.