Hypertext Webster Gateway: "intrusive"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Intrusive \In*tru"sive\, a.
Apt to intrude; characterized by intrusion; entering without
right or welcome.
{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.
From WordNet (r) 1.7 (wn)
intrusive
adj 1: tending to intrude (especially upon privacy); "she felt her
presence there was intrusive" [ant: {unintrusive}]
2: (geology) of rock material; forced while molten into cracks
between layers of other rock [ant: {extrusive}]
3: thrusting inward; "an intrusive arm of the sea" [ant: {protrusive}]
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