/ Dictionary / Index T triple superphosphate: Meaning and Definition of Find definitions for: tri'ple superphos'phate Pronunciation: [key] superphosphate (def. 2). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. triple-space triplet Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language