batholith
noun
bath·o·lith ˈba-thə-ˌlith 
: a great mass of intruded igneous rock that for the most part stopped in its rise a considerable distance below the surface
batholithic
ˌba-thə-ˈli-thik
adjective 
Word History
Etymology
borrowed from German Batholith, from Greek báthos "depth" + German -o- -o- + -lith -lith
Note: The term was introduced by the Austrian geologist Eduard Suess (1831-1914) in Das Antlitz der Erde, Band 1 (Prague & Leipzig, 1883), p. 219.
First Known Use
1884, in the meaning defined above