The Collaborative International Dictionary of English v.0.48:

Acipenseridae \Acipenseridae\ prop. n.
   The natural family of fish including the sturgeons.

   Syn: family Acipenseridae.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Acipenseridae
    n 1: sturgeons [syn: Acipenseridae, family Acipenseridae]