NCIt definition : The husk of the dried ripe seeds of the Plantago psyllium, P. Indica, P. Ovata, and
P. Arenaria plants with laxative and cholesterol lowering activities. The husks contain
mucilage that swells on exposure to water and provides an indigestible mucilaginous
mass in the intestines, thereby causing lubrication, contraction of the smooth muscles
of the intestinal walls, and thus stimulating bowel movement. Psyllium husk is rich
in soluble fiber and has a cholesterol-lowering effect.;
Alternative definition : NCI-GLOSS: A plant with seeds that are used as a mild laxative. The outer layer of
the seeds swells when wet. This increases the size of stool and helps it pass more
easily through the intestines (lower part of the digestive tract). Psyllium is a type
of bulk laxative.;