Source : Webster's Revised Unabridged Dictionary (1913)

Hyacinthine \Hy`a*cin"thine\, a. [L. hyacinthinus, Gr. ?.]
   Belonging to the hyacinth; resemblingthe hyacinth; in color
   like the hyacinth. --Milton.

         His curling locks like hyacinthine flowers. --Cowper.

         The hyacinthine boy, for whom Morn well might break and
         April bloom.                             --Emerson.