/ Dictionary / Index N nyctalopia: Meaning and Definition of Find definitions for: nyc•ta•lo•pi•a Pronunciation: (nik"tl-ō'pē-u), [key] — n. Ophthalm. See hemeralopia. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: nyctalopia (Thesaurus) nyctalgia nycti- 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