ὑακίνθος, -ου, ό [in LXX chiefly for תְּכֵלֶת ;] hyacinth; (a) in cl., a flower, prob. the dark blue iris; (b) in late writers, a precious stone of the same colour, perhaps the sapphire: Rev.21:20 (Phil., FlJ, al.).† (AS)
STRONG'S WORD STUDY
G5192 — ὑάκινθος
huakinthos · hyacinth · Greek