ὑακίνθινοςhuakínthinŏs, hoo-ak-in'-thee-nos; from G5192; "hyacinthine" or "jacinthine", i.e. deep blue:—jacinth.
Thayer's Greek Lexicon
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STRONGS G5191:
ὑακίνθινοςὑακινθινη, ὑακίνθινον (ὑάκινθος), of hyacinth, of the color of hyacinth, i. e. of a red color bordering on black (Hesychiusὑακινθιον. ὑπομελανιζον): Revelation 9:17 (Homer, Theocr, Lucian, others; the Sept.).