/ Dictionary / Index S spreading center: Meaning and Definition of Find definitions for: spread'ing cen'ter Pronunciation: [key] — Geol. Geol. a linear zone in the sea floor along which magma rises and from which adjacent crustal plates are moving apart. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. spreader-ditcher spread option Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language