|an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.|
|a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.|
hypersensitive hy·per·sen·si·tive (hī'pər-sěn'sĭ-tĭv)
Responding excessively to the stimulus of a foreign agent, such as an allergen; abnormally sensitive.