'Intrusive rocks' definitions:

Definition of 'Intrusive rocks'

From: GCIDE
  • Intrusive \In*tru"sive\, a. Apt to intrude; characterized by intrusion; entering without right or welcome. [1913 Webster]
  • Intrusive rocks (Geol.), rocks which have been forced, while in a plastic or melted state, into the cavities or between the cracks or layers of other rocks. The term is sometimes used as equivalent to plutonic rocks. It is then contrasted with effusive or volcanic rocks. -- {In*tru"sive*ly}, adv. -- {In*tru"sive*ness}, n. [1913 Webster]