adjective Date: 1816 relating to or formed by geological extrusion from the earth in a molten state or as volcanic ash

New Collegiate Dictionary. 2001.

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  • Extrusive — Ex*tru sive, a. [See {Extrude}.] (Geol.) Forced out at the surface; as, extrusive rocks; contrasted with {intrusive}. [Webster 1913 Suppl.] …   The Collaborative International Dictionary of English

  • Extrusive — refers to the mode of igneous volcanic rock formation in which hot magma from inside the Earth flows out (extrudes) onto the surface as lava or explodes violently into the atmosphere to fall back as pyroclastics or tuff. This is opposed to… …   Wikipedia

  • extrusive — 1816, from L. extrusus, pp. of EXTRUDERE (Cf. extrudere) (see EXTRUSION (Cf. extrusion)) + IVE (Cf. ive). Related: Extrusively …   Etymology dictionary

  • extrusive — [ek stro͞o′siv] adj. 1. extruding or tending to extrude 2. Geol. designating or of igneous rock formed from lava that hardened on the surface of the earth, moon, etc.: cf. INTRUSIVE (sense 2) …   English World dictionary

  • extrusive — ● extrusif, extrusive adjectif Relatif à une extrusion …   Encyclopédie Universelle

  • extrusive — /ik strooh siv, ziv/, adj. 1. tending to extrude. 2. pertaining to extrusion. 3. Also, effusive. Geol. noting or pertaining to a class of igneous rocks that have been forced out in a molten or plastic condition upon the surface of the earth.… …   Universalium

  • extrusive — 1. adjective Jutting out; extruding. See Also: extrude, extrusion, detrusive, intrusive, protrusive, retrusive 2. noun Rock which has been formed through volcanic extrusion …   Wiktionary

  • extrusive —   lit. forced out. In geography, applied to volcanic material that reaches the surface. May be lava, pyrolclasts or gases …   Geography glossary

  • extrusive —    (adjective)    Said of igneous rocks and sediments derived from deep seated, molten matter (magma), deposited and cooled on the earth s surface (e.g., including lava flows and tephra deposits).    Compare: intrusive, volcanic.    HP …   Glossary of landform and geologic terms

  • extrusive — adj. tending to push out; tending to project; of molten rock that was forced through cracks in the earth s surface …   English contemporary dictionary

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