Source : Webster's Revised Unabridged Dictionary (1913)

Amaranthine \Am`a*ran"thine\, a.
   1. Of or pertaining to amaranth. ``Amaranthine bowers.''
      --Pope.

Source : WordNet®

amaranthine
     adj 1: of or related to the amaranth plant
     2: of an imaginary flower that never fades [syn: {unfading}]