/ Dictionary / Index P psf: Meaning and Definition of Find definitions for: psf Pronunciation: [key] pounds per square foot. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: psf (Thesaurus) pseudotuberculosis PSG Related Content Daily Word Quiz: miscreant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language