/ Dictionary / Index Y Yerkish: Meaning and Definition of Find definitions for: Yer•kish Pronunciation: (yûr'kish), [key] — n. an experimental language for communicating with apes, using symbols consisting of geometric shapes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Yerkes Observatory yes Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language