The Collaborative International Dictionary of English v.0.48:
Mithra \Mi"thra\, Mithras \Mi"thras\, prop. n. [L., from Gr. ?.] The sun god of the ancient Persians; the god of light and truth. [1913 Webster] mithraicWordNet (r) 3.0 (2006):
Mithra n 1: ancient Persian god of light and truth; sun god [syn: Mithras, Mithra]