/ Dictionary / Index S simian shelf: Meaning and Definition of Find definitions for: sim'ian shelf' Pronunciation: [key] a shelflike thickening along the inside of the mandible, characteristic of the anthropoid apes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. simian simian virus 40 Related Content Daily Word Quiz: inutiae Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language