Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
catlaster, tri, m. [contr. for catulaster from catulus; cf. Charis. p. 65 P.; Prisc. p. 618 ib. and 628 ib.], a boy, lad, stripling: catulaster βούπαις, πάλληξ, Gloss. Philox.; Vitr. 8, 3, 24 Schneid. (p. 242 Bip. catastros).