/ Dictionary / Index H Huygens eyepiece: Meaning and Definition of Find definitions for: Huy'gens eye'piece Pronunciation: [key] — Optics. Optics. an eyepiece consisting of two plano-convex lenses, the plane sides of which both face the eye. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Huygens Huygens principle Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language