The Collaborative International Dictionary of English v.0.48:
Acipenser \Ac`i*pen"ser\, prop. n. [L., the name of a fish.] (Zool.) A genus of ganoid fishes, including the sturgeons, having the body armed with bony scales, and the mouth on the under side of the head. See Sturgeon. [1913 Webster]WordNet (r) 3.0 (2006):
Acipenser n 1: type genus of the Acipenseridae: sturgeons [syn: Acipenser, genus Acipenser]