Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Tēnos or -us, i, f., = Τῆνος, one of the Cyclades, between Andros and Delos, now Tino, Mel. 2, 7, 11; Plin. 4, 12, 22, § 65; Liv. 36, 21; Ov. M. 7, 469.