mas·sive / ˈmasiv/ • adj. 1. large and heavy or solid: a massive rampart of stone.2. exceptionally large: massive crowds are expected. ∎  very intense or severe: a massive heart attack. ∎ inf. particularly successful or influential: the title song became a massive hit.3. Geol. (of rocks or beds) having no discernible form or structure. ∎  (of a mineral) not visibly crystalline.DERIVATIVES: mas·sive·ly adv. a massively complicated network. mas·sive·ness n.

massive Lacking in any form or structure, e.g. massive beds are those without internal grading (see GRADE), and lacking sedimentary structures. Applied to a compact mineral which has no distinguishing crystal form.

massive XV. — F. massif, fem. -ive, alt. of OF. massiz :- pop. L. *massīceus, f. massa MASS2; see -IVE. Finally repl. (arch.) massy XIV, perh. orig. — OF. massiz, with later assim. to -Y1.