/ Dictionary / Index L lattice constant: Meaning and Definition of Find definitions for: lat'tice con"stant Pronunciation: [key] — Crystall. Crystall. a parameter, either a measure of length or angle, that defines the size and shape of the unit cell of a crystal lattice. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. lattice latticed Related Content Daily Word Quiz: tenacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language