The Collaborative International Dictionary of English v.0.48:

massive \mass"ive\ (m[.a]s"[i^]v), a. [F. massif.]
   1. Forming, or consisting of, a large mass; compacted;
      weighty; heavy; massy. "Massive armor." --Dr. H. More.
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   2. (Min.) In mass; not necessarily without a crystalline
      structure, but having no regular form; as, a mineral
      occurs massive.
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   Massive rock (Geol.), a compact crystalline rock not
      distinctly schistose, as granite; also, with some authors,
      an eruptive rock.
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