bulk

bulk

(bŭlk)

n.

See fiber.

v. bulked, bulking, bulks

noun Increased muscle mass achieved by mechanics—lifting weights—and/or chemistry—anabolic steroids
verb To enhance one’s muscle mass by mechanics and/or chemistry

bulk

1. In nutrition, a substance that absorbs water in the intestinal tract. The increased mass helps to stimulate peristalsis. Bulk materials include bran cereals, cellulose, lignins, and psyllium. They are used therapeutically to treat constipation and other bowel disorders.

2. A mass; a large volume of cells, such as might be found in a tumor.