/ Dictionary / Index O oligochaete: Meaning and Definition of Find definitions for: ol•i•go•chaete Pronunciation: (ol'i-gō-kēt"), [key] — n. any of various annelids of the family Oligochaeta, including earthworms and certain small, freshwater species, having locomotory setae sunk directly in the body wall. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: oligochaete (Thesaurus) Oligocene oligoclase Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language