WordReference Random House Unabridged Dictionary of American English © 2019
au•re•o•lin  (ô rēə lin, ə rē-),USA pronunciation n. 
  1. Fine Arta pigment used in painting, consisting of potassium cobaltinitrite and characterized by its brilliant yellow hue, transparency, and permanence. Also called  cobalt yellow. 
au•re•o•line  (ô rēə lin, -līn′, ə rē-),USA pronunciation adj. 
  • Latin aureol(us) golden, of gold (see aureole) + -in2
  • 1875–80;

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