Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† nymphēum (NYMFEVM, Inscr. Orell. 57; 5049; NYMPHAEVM, ib. 3317), i, n., = νυμφεῖον, a fountain consecrated to the nymphs at Corinth, Plin. 35, 12, 43, § 151; Capitol. Gord. 32; Cod. Just. 11, 42, 5; 11, 42, 6; Amm. 15, 7, 3; Inscr. Orell. l. l.