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.
[Middle English massif, from Old French, from masse, mass; see MASS.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.