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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. n. Excess pigmentation, especially of the skin.

Century Dictionary and Cyclopedia

  1. n. An excess of pigmentation.

Wiktionary

  1. n. The darkening of an area of skin or nails, caused by increased melanin.

WordNet 3.0

  1. n. unusual darkening of the skin

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‘hyperpigmentation’ has been looked up 361 times, added to 2 lists, and is not a valid Scrabble word.