BRACHYURA

Brachyura, suborder Brachyura

(noun) an order of crustaceans (including true crabs) having a reduced abdomen folded against the ventral surface

Source: WordNet® 3.1

Brach`y*u"ra, n. pl. Etym: [NL., fr. Gr. (Zoöl.)

Definition: A group of decapod Crustacea, including the common crabs, characterized by a small and short abdomen, which is bent up beneath the large cephalo-thorax. [Also spelt Brachyoura.] See Crab, and Illustration in Appendix.

Source: Webster’s Unabridged Dictionary 1913 Edition