noun, plural jack·smelts, (especially collectively) jack·smelt.

  1. a large silversides, Atherinopsis californiensis, found along the coast of California, that grows to a length of 22 inches (55 cm).

noun plural -smelts or -smelt

  1. a marine teleost food fish, Atherinopsis californiensis, of American coastal waters of the North Pacific: family Atherinidae (silversides)
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