n.;
a. [ Cf. F. abdominal. ]
Abdominal ring (Anat.),
‖n. pl. [ NL., masc. pl. ] (Zool.) A group including the greater part of fresh-water fishes, and many marine ones, having the ventral fins under the abdomen behind the pectorals. [ 1913 Webster ]
‖n. pl. [ NL., neut. pl. ] (Zool.) A group of cirripeds having abdominal appendages. [ 1913 Webster ]