/ Dictionary / Index P Permalloy: Meaning and Definition of Find definitions for: Perm•al•loy Pronunciation: (pûrm"al'oi, pûr'mu-loi"), [key] — Trademark. Trademark. a brand name for any of a class of alloys of high magnetic permeability, containing from 30 to 90 percent nickel. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: permalloy (Thesaurus) permafrost table permanence Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language