Douglas Harper's Etymology Dictionary
from Avestan ahura- "spirit, lord," from Indo-Iranian *asuras, from suffixed form of PIE root *ansu- "spirit" (see Asgard) + Avestan mazda- "wise," from PIE *mens-dhe- "to set the mind," from root *men- "to think" (see mind (n.)).
Wikipedia
Ahura Mazda (;) (also known as Ohrmazd, Ahuramazda, Hourmazd, Hormazd, Harzoo and Hurmuz, Lord or simply as spirit) is the Avestan name for the creator and sole God of Zoroastrianism, the old Mede and Persian religion which spread across Asia predating Christ. Ahura Mazda is described as the highest spirit of worship in Zoroastrianism, along with being the first and most frequently invoked spirit in the Yasna. The literal meaning of the word Ahura is "mighty" or "lord" and Mazda is wisdom. Zoroastrianism revolves around three basic tenets – Good Thoughts, Good Words and Good Deeds.
Ahura Mazda first appeared in the Achaemenid period (c. 550 – 330 BCE) under Darius I's Behistun Inscription. Until Artaxerxes II (405–04 to 359–58 BCE), Ahura Mazda was worshipped and invoked alone. With Artaxerxes II, Ahura Mazda was invoked in a triad, with Mithra and Apam Napat. In the Achaemenid period, there are no representations of Ahura Mazda other than the custom for every emperor to have an empty chariot drawn by white horses, to invite Ahura Mazda to accompany the Persian army on battles. Images of Ahura Mazda began in the Parthian period, but were stopped and replaced with stone carved figures in the Sassanid period.
Usage examples of "ahura mazda".
Huge paintings adorned the inner walls, depicting the gods of the Persians, the mighty Ahura Mazda, the Wise Lord, and the minor daevas that served him.
I would fool all this great city with the Heart of Ahura Mazda, and with the great exhibition of the power of the jewel.
The actual command had been issued amid the grief of the batik's aftermath, when His Majesty's blood was raging over the loss before his own eyes of thousands, by some counts as many as twenty thousand, of the Empire's finest warriors slain by the troops of Leonidas, whose defiance of God Ahura Mazda's will could only be perceived through Persian eyes as an outrage against heaven.
When next the Sun, the divine promise of Ahura Mazda, mounts his throne, we shall be free, every one of us, and once more in the Empire.
By the Sacred Spirit of great Ahura Mazda, thought Bill hopefully.
Eventually religions sprang up in which the chief god, the god of light, the Sun god, was called Ahura Mazda.