/ Dictionary / Index P psyllium: Meaning and Definition of Find definitions for: psyl•li•um Pronunciation: (sil'ē-um), [key] — n. fleawort. Also calledthe seeds of this plant, used as a laxative. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: psyllium (Thesaurus) psyllid yellows psywar Related Content Daily Word Quiz: philanthropy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language