Arthrostraca
Pronunciation : Ar*thros"tra*ca
Part of Speech : n. pl.
Etymology : [NL., fr. Gr. (Zo?l.)
Definition : Defn: One of the larger divisions of Crustacea, so called because the thorax and abdomen are both segmented; Tetradecapoda. It includes the Amphipoda and Isopoda.
Source : Webster's Unabridged Dictionary, 1913