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hyacinthian

hyacinthian, a.
  (haɪəˈsɪnθɪən)
  [f. L. hyacinth-us + -ian.]
  Of or pertaining to the hyacinth (sense 1 or 2), hyacinthine.

1714 Eusden Crt. of Love in Steele's Poet. Misc. 102 Proud Columns..That hewn from Hyacinthian Quarries came. 1794 A. M. Bennett Ellen I. 5 A profusion of white waving locks..conveyed some idea of their hyacinthian beauty, before age had silvered them over. 1858 Caswall Poems 93 Hyacinthian blue.

Oxford English Dictionary

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