amaranthine am·a·ran·thine (adjective/noun) 1. Eternally beautiful and unfading; everlasting. 2. Deep purple-red. Her eyes were the color of amethyst crystal. "Do you dream in color?" She whispered in a hushed voice. "Do you dream of a far away forest of birch and pine, covered in fresh-fallen snow?" The first color she saw permanently was scarlet, blossoming crimson. Like blood, a trail through crystalline snow.