Definition of hyperpigmentation in English:

hyperpigmentation

Line breaks: hyper|pig¦men|ta¦tion

Entry from British & World English dictionary

noun

[mass noun]
Excessive pigmentation of the skin.

Definition of hyperpigmentation in:

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Word of the day hypnopompic
Pronunciation: ˌhɪpnə(ʊ)ˈpɒmpɪk
adjective
relating to the state immediately preceding waking up