Argulus \Ar"gu*lus\, n. [NL., dim of Argus.] (Zool.) A genus of copepod Crustacea, parasitic of fishes; a fish louse. See {Branchiura}. [1913 Webster]
Branchiura \Bran"chi*u"ra\, n. pl. [NL., fr., Gr. ? gill + o'yra` tail.] (Zool.) A group of Entomostraca, with suctorial mouths, including species parasitic on fishes, as the carp lice ({Argulus}). [1913 Webster]