Definitions for brachyura
Brachyura, suborder Brachyura(noun)
an order of crustaceans (including true crabs) having a reduced abdomen folded against the ventral surface
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
U.S. National Library of Medicine
An infraorder of chiefly marine, largely carnivorous CRUSTACEA, in the order DECAPODA, including the genera Cancer, Uca, and Callinectes.