|a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.|
|an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.|
pepsinogen pep·sin·o·gen (pěp-sĭn'ə-jən)
The inactive precursor to pepsin, formed in the chief cells of the mucous membrane of the stomach and converted to pepsin by hydrochloric acid during digestion. Also called propepsin.