Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† ĕtymon, i, n., = ἔτυμον, the origin of a word: etymon habere, to be derived, Varr. R. R. 1, 48, 2: etyma (with origines), Gell. 18, 4, 11 al.