bulk

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bulk

(bŭlk)
n.
See fiber.
v. bulked, bulking, bulks
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
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
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

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.
Medical Dictionary, © 2009 Farlex and Partners