nigrescence


nigrescence
ni·gres·cence (nī-grĕsʹəns) n.
1. The process of becoming black or dark.
2. Blackness or darkness, as of complexion.
  [From nigrescent, blackish, from Latin nigrēscēns, nigrēscent- present participle of nigrēscere, to become black, from niger, nigr-, black. See nekʷ-t-.   ni·gresʹcent adj.

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