|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 extraordinary or unusual thing, person, or event; an exceptional example or instance.|
intermittent in·ter·mit·tent (ĭn'tər-mĭt'nt)
Stopping and starting at intervals.
Marked by intervals of complete quietude occurring between two periods of activity.