/ Dictionary / Index S subprime: Meaning and Definition of Find definitions for: sub•prime Pronunciation: (sub-prīm'), [key] — adj. being of less than top quality: a subprime grade of steel. being below a prime rate: banks engaging in subprime lending. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. subprimal subprincipal Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language