/ Dictionary / Index P pluteus: Meaning and Definition of Find definitions for: plu•te•us Pronunciation: (pl'tē-us), [key] — pl. -te•i -te•us•es. the free-swimming, bilaterally symmetrical larva of an echinoid or ophiuroid. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pluteus (Thesaurus) Plutarch's Lives* Pluto Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language