Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
nī̆grĭcans, antis, P. a., v. nigrico fin.
nī̆grĭco, āre, v. n. [1. niger], to be blackish (post-Aug.): epimelas fit, cum in candidā gemmā superne nigricat colos, Plin. 37, 10, 58 fin.; cf. Not. Tir. p. 128.
Hence, nĭgrĭcans, antis, P. a., blackish, swarthy: Tyrius color nigricans aspectu, Plin. 9, 38, 62, § 135; 36, 26, 66, § 193.