Strong’s Greek
G4450 — purrhos
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
πυρρός
purrhos — pronounced poor-hros'
from 4442; fire-like, i.e. (specially), flame- colored:--red. see GREEK for 4442
2 occurrences in the KJV.
Revelation 6:4
And there went out another horse that was red: and power was given to him that sat thereon to take peace from the earth, and that they should kill one another: and there was given unto him a great sword.
Revelation 12:3
And there appeared another wonder in heaven; and behold a great red dragon, having seven heads and ten horns, and seven crowns upon his heads.