2 definitions found From The Collaborative International Dictionary of English v.0.44 [gcide]: Abdominal \Ab*dom"i*nal\, noun; E. pl. {Abdominals}, L. pl. {Abdominales}. A fish of the group Abdominales. || From The Collaborative International Dictionary of English v.0.44 [gcide]: Abdominales \Ab*dom'i*na"les\, noun pl. [NL., masc. pl.] (Zo["o]l.) A group including the greater part of fresh-water fishes, and many marine ones, having the ventral fins under the abdomen behind the pectorals. ||

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