Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
vĕtĕrasco, rāvi, 3, v. inch. n. [id.], to grow old: veterascens ad gloriam, Cic. Fragm. ap. Non. p. 437, 29: pati aliquid veterascere, Col. 2, 14, 2: ut nec vestimenta veterascerent, etc., wear out, Ambros. de Fide, 2, 2, 23: cum febres veteraverunt, Cels. 3, 12, 6 (dub.; al. inveter-); Sen. Cons. ad Marc. 1, 8 (dub.; Haase, verterunt): et omnes sicut vestimentum veterascent, Vulg. Psa. 101, 27.
vĕtĕro, āvi, ātum, 1, v. a. [vetus], to make old (late Lat.): dicendo autem novum veteravit prius, Vulg. Heb. 8, 13.
P. a.: vĕ-tĕrātus, a, um, old, inveterate: mederi ulceribus veteratis, Plin. 32, 10, 52, § 141: caseus, mouldy, Scrib. Comp. 140.