brach·y·u·ran  (brāk'ē-yŏŏr'ən)  adj. Of or belonging to the Brachyura, a group of crustaceans including the true crabs, characterized by a short abdomen concealed under the cephalothorax. n. A member of the Brachyura. [From New Latin Brachyūra, suborder name : Greek brakhu-, brachy- + Greek ourā, tail; see -urous.] |