Bulk - definition of bulk by The Free Dictionary
bulk (bŭlk) n. 1. Size, mass, or volume, especially when very large. 2. a. A distinct mass or portion of matter, especially a large one: the dark bulk of buildings against the sky. b. The body of a human, especially when large or muscular. 3. The major portion or greater part: "The great bulk of necessary work can never be anything but painful ...