/ Dictionary / Index P permafrost: Meaning and Definition of Find definitions for: per•ma•frost Pronunciation: (pûr'mu-frôst", -frost"), [key] — n. (in arctic or subarctic regions) perennially frozen subsoil. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: permafrost (Thesaurus) perm permafrost table Related Content Daily Word Quiz: hale Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language