/ Dictionary / Index G groundsill: Meaning and Definition of Find definitions for: ground•sill Pronunciation: (ground'sil"), [key] — n. the lowermost sill of a framed structure, esp. one lying close to the ground. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. groundsheet groundskeeper Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language