1. A nymph of lake Tritonis in Libya, who according to an ancient tradition was the mother of Athena by Poseidon. (Herod. iv. 180; Pind. Pyth. iv. 20.) By Amphithemis she became the mother of Nasamon and Caphaurus. (Apollon. Rhod. iv. 1495.)

2. A surname of Athena, like Tritogeneia and Tritonia. (Apollon. Rhod. i. 72, 109; Virg. Aen. ii. 171.)