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| 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. |
barrel cactus
name for a group of more or less barrel-shaped cacti, family Cactaceae, native to North and South America. It is most often used for two large-stemmed North American genera, Ferocactus and Echinocactus. Small barrel cacti include the genera Sclerocactus, Neolloydia, and Thelocactus, and other barrel cacti are Astrophytum and some species of Thelocactus that were previously placed in Hamatocactus.
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