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- in the Appendix of Indo-European roots.] ni·grescent adj. |
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