Extrusive

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Extrusive \Ex*tru"sive\, a. [See {Extrude}.] (Geol.)
     Forced out at the surface; as, extrusive rocks; -- contrasted
     with {intrusive}.
     [Webster 1913 Suppl.]

From WordNet (r) 2.0 [wn]:



  extrusive
       adj : of rock material; forced out while molten through cracks in
             the earth's surface [ant: {intrusive}]