Strong’s Greek
G2463 — iris
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
ἶρις
iris — pronounced ee'-ris
perhaps from 2046 (as a symbol of the female messenger of the pagan deities); a rainbow ("iris"):--rainbow. see GREEK for 2046
2 occurrences in the KJV.
Revelation 4:3
And he that sat was to look upon like a jasper and a sardine stone: and there was a rainbow round about the throne, in sight like unto an emerald.
Revelation 10:1
And I saw another mighty angel come down from heaven, clothed with a cloud: and a rainbow was upon his head, and his face was as it were the sun, and his feet as pillars of fire: