1. formed by the cooling and solidification of molten rock material
Usage: geology
2. of, relating to, or produced by fire or intense heat
Usage: archaic or literary

Examples

• Granite is an igneous rock formed deep beneath Earth's surface.
• Basalt is a common igneous rock found in oceanic crust.
• The igneous intrusion created a new mineral deposit.
• Geologists study igneous formations to understand volcanic activity.
• Obsidian is an igneous glass that forms from rapid cooling of lava.