Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
The word ephippii could not be parsed. Trying a normal dictionary lookup:
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* ĕphippĭātus, a, um, adj., furnished with an ephippium: equites, Caes. B. G. 4, 2, 5.
† ĕphippĭum, ii, n., = ἐφίππιον, a horse-cloth, caparison, housing (cf. clitellae): tegimen equi ad mollem vecturam paratum, Non. p. 108, 30 (pure Lat. stragulum); Varr. R. R. 2, 7, 15; id. ap. Non. l. l.; Caes. B. G. 4, 2, 4; Cic. Fin. 3, 4, 15; Gell. 5, 5, 3 al.
Prov.: optat ephippia bos piger, optat arare caballus, i. e. each envies the other’s condition, Hor. Ep. 1, 14, 43.