Definition of Extrusive

1. Adjective. Of rock material; forced out while molten through cracks in the earth's surface.

Category relationships: Geology
Similar to: Volcanic
Derivative terms: Extrude
Antonyms: Intrusive



Definition of Extrusive

1. a. Forced out at the surface; as, extrusive rocks; -- contrasted with intrusive.

Definition of Extrusive

1. Adjective. Jutting out; extruding. ¹

2. Noun. (geology) Rock which has been formed through volcanic extrusion. ¹

¹ Source: wiktionary.com

Definition of Extrusive

1. [adj]

Extrusive Pictures

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Lexicographical Neighbors of Extrusive

extrudabilities
extrudability
extrudable
extrudate
extrudates
extrude
extruded
extruder
extruders
extrudes
extruding
extrudites
extrusion
extrusion of a tooth
extrusions
extrusive (current term)
extrusives
extry
extubate
extubated
extubates
extubating
extubation
extubations
extuberance
extuberances
extuberancies
extuberancy
extuberant
extuberate

Literary usage of Extrusive

Below you will find example usage of this term as found in modern and/or classical literature:

1. Bulletin by Harvard University Museum of Comparative Zoology (1895)
"The Intrusive and extrusive Triassic Trap Sheets of tlu, Connecticut Valley. ... General Features of Intrusive and extrusive Sheets in Connecticut. 4. ..."

2. The Ancient Volcanoes of Great Britain by Sir Archibald Geikie (1897)
"A. Materials erupted at the Surface—extrusive Series, i. Lavas, their General Characters. Volcanic Cycles, ii. Volcanic Agglomerates, Breccias and Tuffs. ..."

3. Igneous Rocks and Their Origin by Reginald Aldworth Daly (1914)
"CHAPTER VII extrusive BODIES CLASSIFICATION As far as possible the classification of the extrusive bodies should be rigorously tied to field observations. ..."

4. Geology by Thomas Chrowder Chamberlin, Rollin D. Salisbury (1904)
"CHAPTER X. THE extrusive PROCESSES. Outward movements.—In the preceding chapters movements toward the center have been considered. ..."

5. Geology by Thomas Chrowder Chamberlin, Rollin D. Salisbury (1904)
"CHAPTER X. THE extrusive PROCESSES. Outward movements.—In the preceding chapters movements toward the center have been considered. ..."

6. The Fundamental Principles of Petrology by Ernst Weinschenk (1916)
"The character of the contact-metamorphism by extrusive rocks is somewhat different. ... It is only at the contact of extrusive rocks with limestones that a ..."

7. Igneous Rocks: Composition, Texture and Classification, Description and by Joseph Paxson Iddings (1909)
"To the first group belong extrusive eruptive rocks, The second embraces ... extrusive rocks occur in the form of lava streams and sur- ficial sheets, ..."

8. A Text-book of Geology for Use in Universities: Colleges, Schools of Science by Louis Valentine Pirsson, Charles Schuchert (1920)
"There are two chief modes of occurrence of igneous rocks, the intrusive and the extrusive. In the former the magma, rising from depths below, ..."

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