| 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. |
| corrugate | |
| —vb | |
| 1. | (usually tr) to fold or be folded into alternate furrows and ridges |
| —adj | |
| 2. | folded into furrows and ridges; wrinkled |
| [C18: from Latin corrūgāre, from rūga a wrinkle] | |
| corru'gation | |
| —n | |