Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† dĭmĕter (-trus), a, um, adj., = δίμετρος, of two measures or metres (late Lat.): versus, a dimeter, Diom. p. 506 P.; and simply dimetrus (sc. versus), Ter. Maur. p. 2437 ib.