Agneyastra (Sk.). The fiery missiles or weapons used by the Gods in the exoteric Purânas and the Mahâbhârata the magic weapons said to have been wielded by the adept-race (the fourth), the Atlanteans. This “weapon of fire” was given by Bharadwâja to Agnivesa, the son of Agni, and by him to Drona, though the Vishnu Purâna contradicts this, saying that it was given by the sage Aurva to King Sagara, his chela. They are frequently mentioned in the Mahâbhârata and the Râmâyana.
Source: H.P.Blavatsky - The Theosophical Glossary