| 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. |
"For tis the sport to haue the enginer Hoist with his owne petar" ("Hamlet" III.iv.207).See hoist.