| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |
| barium enema | |
| —n | |
| an injection into the rectum of a preparation of barium sulphate, which is opaque to X-rays, before X-raying the lower alimentary canal | |
barium enema n.
The administration of barium in enema form for radiographic study of the lower intestinal tract. Also called contrast enema.