Swim·ming a.
1. That swims; capable of swimming; adapted to, or used in, swimming; as, a swimming bird; a swimming motion.
2. Suffused with moisture; as, swimming eyes.
Swimming bell Zool., a nectocalyx. See Illust. under Siphonophora.
Swimming crab Zool., any one of numerous species of marine crabs, as those of the family Protunidae, which have some of the joints of one or more pairs of legs flattened so as to serve as fins.