barrel cactus

noun
any of several large, cylindrical, ribbed, spiny cacti of the genera Echinocactus and Ferocactus.

Origin:
1880–85, Americanism

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Britannica
Encyclopedia

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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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Eating cactus fruits and barrel cactus in between these trips also helps keep them hydrated.
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