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Formed from (the stem of) Latin īris, Ancient Greek ἶρις (îris) +‎ -al.



iridal (comparative more iridal, superlative most iridal)

  1. (rare) Pertaining to a rainbow.
  2. (chiefly medicine) Pertaining to the iris of the eye.
    • 1969, Vladimir Nabokov, Ada or Ardor, Penguin 2011, p. 44:
      The iridal dark-brown of her serious eyes had the enigmatic opacity of an Oriental hypnotist's look (in a magazine's back-page advertisement) and seemed to be placed higher that usual so that between its lower rim and the moist lower lid a cradle crescent of white remained when she stared straight at you.