Real Dictionary

sturgeon
variable noun: A sturgeon is a large fish which lives in northern parts of the world. Sturgeon are usually caught for their eggs, which are known as caviar.

sturgeon in American English
any of a family (Acipenseridae, order Acipenseriformes) of large, edible, primitive bony fishes having rows of spiny plates along the body and a projecting snout: valuable as a source of caviar and isinglass
noun: any of various large fishes of the family Acipenseridae, inhabiting fresh and salt North Temperate waters, valued for their flesh and as a source of caviar and isinglass A. brevirostrum, of the Atlantic coast, is endangered

sturgeon in British English
noun: any primitive bony fish of the family Acipenseridae, of temperate waters of the N hemisphere, having an elongated snout and rows of spines along the body: valued as a source of caviar and isinglass
noun: Nicola (Ferguson). born 1970, Scottish Nationalist politician; first minister of the Scottish Parliament from 2014