'Holostraca' definitions:

Definition of 'Holostraca'

From: GCIDE

Holostraca \Ho*los"tra*ca\, n. pl. [NL., fr. Gr. "o`los whole + ? shell of a testacean.] (Zool.) A division of phyllopod Crustacea, including those that are entirely covered by a bivalve shell. [1913 Webster]