/ Dictionary / Index S sedimentary: Meaning and Definition of Find definitions for: sed•i•men•ta•ry Pronunciation: (sed"u-men'tu-rē), [key] — adj. of, pertaining to, or of the nature of sediment. formed by the deposition of sediment, as certain rocks. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sedimentary (Thesaurus) sediment sedimentation Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language