/ Dictionary / Index K koilonychia: Meaning and Definition of Find definitions for: koil•o•nych•i•a Pronunciation: (koi"lō-nik'ē-u), [key] — n. Med. an abnormal condition in which the outer surfaces of the nails are concave; spoon nail. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. koi koine Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language