/ Dictionary / Index S soil stack: Meaning and Definition of Find definitions for: soil' stack" Pronunciation: [key] — Plumbing. Plumbing. a vertical soil pipe. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. soil science soilure Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language