'Pectostraca' definitions:

Definition of 'Pectostraca'

From: GCIDE

Pectostraca \Pec*tos"tra*ca\ (p[e^]k*t[o^]s"tr[.a]*k[.a]), prop. n. pl. [NL., fr. Gr. phkto`s fixed + 'o`strakon shell of a testacean.] (Zool.) A degenerate order of Crustacea, including the Rhizocephala and Cirripedia. [1913 Webster]