Anything, such as agar, that increases the bulk of material in the intestine, thereby stimulating peristalsis. ... (05 Mar 2000) ... Found on http://www.encyclo.co.uk/local/20973
(bulk´әj) material that will increase the mass (bulk) of the intestinal contents and consequently stimulate peristalsis. Found on http://www.encyclo.co.uk/local/21001