/ Dictionary / Index C crown lens: Meaning and Definition of Find definitions for: crown' lens" Pronunciation: [key] — Optics. Optics. a lens made of crown glass, usually used as the converging lens component of an achromatic lens. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. crown land crown octavo Related Content Daily Word Quiz: winsome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language