intrusive igneous rock Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a type of rock formed from magma that cools slowly beneath the Earth's surface. Example Sentence Granite is the most common intrusive igneous rock. More Example Sentences This rock forms deep inside the Earth. Synonyms plutonic rock; granite; diorite Hear It! Say It! Write It! intrusive igneous rock Switch to cursive Start Share with your friends: