Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Amphītrītē, ēs, f., = Ἀμφιτρίτη, Amphitrite, the wife of Neptune, and goddess of the Sea, Col. 10, 201; hence an appel. for the sea, Ov. M. 1, 14; Cat. 64, 11.