Bible Dictionaries

A — 1: ὑάκινθος
(Strong's #5192 — Noun Masculine — huakinthos — hoo-ak'-in-thos )

primarily denoted "a hyacinth," probably the dark blue iris; then, "a precious stone," most likely the sapphire, Revelation 21:20 .

B — 1: ὑακίνθινος
(Strong's #5191 — Adjective — huakinthinos — hoo-ak-in'-thee-nos )

signifies "hyacinthine," perhaps primarily having the color of the hyacinth. Some regard its color as that of the martagon lily, a dusky red. According to Swete, the word in Revelation 9:17 is "doubtless meant to describe the blue smoke of a sulphurous flame."