/ Dictionary / Index G Gay-Lussac: Meaning and Definition of Find definitions for: Gay-Lus•sac Pronunciation: (gā"lu-sak' Fr. gā-ly-sak'), [key] — n. 1778–1850, French chemist and physicist. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: gay-lussac (Thesaurus) Gaylord Gay-Lussac's law 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