1) Animal order 2) Suborder brachyura 
• (n. pl.) 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.
Brach`y·u'ra noun plural [ New Latin , from Greek 
Brachyura is a sub-order or section of the ten-footed crustaceans or crabs (Decapoda), having a very short jointed tail folded closely under the thorax as in the common crab.
[n] - an order of crustaceans (including true crabs) having a reduced abdomen folded against the ventral surface
suborder Brachyura noun an order of crustaceans (including true crabs) having a reduced abdomen folded against the ventral surface