Natrix, nátricis. pen. cor. m. & f. g. Cic. Lucan. A watersnake: also an hearbe the roote whereof stinketh like a Goate.
Lewis and Short: Latin dictionary
nātrix, īcis (once m.: natrix violator aquae, Luc. 9, 720; usually), f. [no]. I.A water-snake: cur deus tantam vim natricum viperarumque fecerit?Cic. Ac. 2, 38, 120.—2.Trop., of a dangerous person: se natricem educare, Suet. Calig. 11.—B.Transf., a whip, scourge, made of a watersnake's skin: natibu' natricem impressit crassam et capitatam, Lucil. ap. Non. 65, 30.—II.A plant: Ononis natrix, Linn.; Plin. 27, 12, 83, 107.