|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.|
hyperactive hy·per·ac·tive (hī'pər-āk'tĭv)
Highly or excessively active, as a gland.
Having behavior characterized by constant overactivity.
Afflicted with attention deficit disorder.