Entry 1 sense Webster, 1913 Antinephritic /(ăn"tĭ*nē̇*frĭt"ĭk)/ · An·ti·ne·phrit·ic · IPA 01 a. Counteracting, or deemed of use in, diseases of the kidneys. 1. Counteracting, or deemed of use in, diseases of the kidneys.(Med.)