/ Dictionary / Index J jacksmelt: Meaning and Definition of Find definitions for: jack•smelt Pronunciation: ( jak'smelt"), [key] — pl. -smelts, -smelt. a large silversides, Atherinopsis californiensis, found along the coast of California, that grows to a length of 22 in. (55 cm). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: jacksmelt (Thesaurus) jackshaft jacksnipe Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language