/ Dictionary / Index S straining sill: Meaning and Definition of Find definitions for: strain'ing sill" Pronunciation: [key] (in a roof with a queen post) a compression member lying along the tie beam and separating the feet of the struts. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. straining piece strait Related Content Daily Word Quiz: meritocracy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language