What is the Greek meaning of word igneous?

The Greek meaning of the word igneous is 'produced by fire'. It is derived from the Greek word 'ignis', which means 'fire'. Igneous rocks are formed when molten rock cools and solidifies. This can happen on the surface of the Earth, such as when lava cools after a volcanic eruption, or deep underground, such as when magma cools slowly within the Earth's crust. Igneous rocks are classified according to their texture, composition, and where they were formed.