buckthorn

[buhk-thawrn]

buck·thorn

[buhk-thawrn]
noun
1.
any of several, sometimes thorny trees or shrubs belonging to the genus Rhamnus, especially R. frangula, the bark of which is used in medicine. Compare buckthorn family.
2.
a tree or shrub belonging to the genus Bumelia, of the sapodilla family, especially B. lycioides, a thorny tree having elliptic leaves and large clusters of white flowers, common in the southern and part of the central U.S.

Origin:
1570–80; buck1 + thorn, rendering Neo-Latin cervi spina
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Buckthorn is always a great word to know.
So is doohickey. Does it mean:
a gadget; dingus; thingumbob.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
Collins
World English Dictionary
buckthorn (ˈbʌkˌθɔːn)
 
n
See also sea buckthorn any of several thorny small-flowered shrubs of the genus Rhamnus, esp the Eurasian species R. cathartica, whose berries were formerly used as a purgative: family Rhamnaceae
 
[C16: from buck1 (from the spiny branches, imagined as resembling antlers) + thorn]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Britannica
Encyclopedia

buckthorn

any of about 100 species of shrubs or trees belonging to the genus Rhamnus, family Rhamnaceae, native to temperate areas in the Northern Hemisphere. The cascara buckthorn (R. purshiana) is the source of cascara sagrada, a cathartic drug.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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