/ Dictionary / Index P perilymph: Meaning and Definition of Find definitions for: per•i•lymph Pronunciation: (per'i-limf"), [key] — n. Anat. the fluid between the bony and membranous labyrinths of the ear. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: perilymph (Thesaurus) perilune perimeter Related Content Daily Word Quiz: belligerent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language