The Collaborative International Dictionary of English v.0.48:

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]

WordNet (r) 3.0 (2006):

Branchiura
    n 1: copepods with suctorial mouthparts; parasitic on fishes
         [syn: Branchiura, order Branchiura]