Entry 1 sense Webster, 1913 Hyacinthine · Hy·a·cin·thine · IPA 01 a. Belonging to the hyacinth; resembling the hyacinth; in color like the hyacinth. 1. Belonging to the hyacinth; resembling the hyacinth; in color like the hyacinth. “His curling locks like hyacinthine flowers.” — Cowper. “The hyacinthine boy, for whom Morn well might break and April bloom.” — Emerson.