a. Consisting of or making up a large mass; bulky, heavy, and solid: a massive piece of furniture. See Synonyms at heavy.

b. Physics Having relatively high mass: a massive particle.

a. Large or imposing, as in quantity, scope, degree, intensity, or scale: "Local defense must be reinforced by the further deterrent of massive retaliatory power" (John Foster Dulles).

b. Large in comparison with the usual amount: a massive dose of a drug.

c. Affecting a large area of bodily tissue; widespread and severe: massive gangrene.

a. Mineralogy Lacking internal crystalline structure; amorphous.

b. Geology Without internal structure or layers and homogeneous in composition. Used of a rock.