EXTRUSIVE definition: tending to extrude. See examples of extrusive used in a sentence.

If the magma contains abundant volatile components which are released as free gas, then it may cool with large or small vesicles (bubble-shaped cavities) such as in pumice, scoria, or vesicular basalt. …

Both lava flows and pyroclastic debris (fragmented volcanic material) are extrusive; they are commonly glassy (obsidian) or finely crystalline (basalts and felsites).

Extrusive rocks, on the other hand, cool rapidly at the surface, resulting in fine-grained or even glassy textures. Both types play important roles in the Earth's geology and have various practical applications.

5 days ago · extrusive Definitions of extrusive adjective of rock material; forced out while molten through cracks in the earth's surface

Definition of extrusive adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Define extrusive. extrusive synonyms, extrusive pronunciation, extrusive translation, English dictionary definition of extrusive. adj. Derived from magma poured out or ejected at the earth's surface.

EXTRUSIVE definition: tending to extrude | Meaning, pronunciation, translations and examples in American English

Jan 14, 2026 · Noun extrusive (plural extrusives) (geology) Rock which has been formed through volcanic extrusion.

The meaning of EXTRUSIVE is relating to or formed by geologic extrusion from the earth in a molten state or as volcanic ash. How to use extrusive in a sentence.