/ Dictionary / Index P presbyopia: Meaning and Definition of Find definitions for: pres•by•o•pi•a Pronunciation: (prez"bē-ō'pē-u, pres"-), [key] — n. Ophthalm. farsightedness due to ciliary muscle weakness and loss of elasticity in the crystalline lens. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: presbyopia (Thesaurus) presbycusia Presbyt. Related Content Daily Word Quiz: exemplary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language