Breadcrumb Home > 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: tatterdemalion Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language