/ Dictionary / Index P plessor: Meaning and Definition of Find definitions for: ples•sor Pronunciation: (ples'ur), [key] — n. Med. plexor. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: plessor (Thesaurus) plesiosaur plethora Related Content Daily Word Quiz: miscreant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language