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aculeus

[uh-kyoo-lee-uhs]

noun, plural -le·i

[-lee-ahy] .

Also, acus. the modified ovipositor or sting of certain hymenopterous insects.

prickle (def. 2).

Origin:
1820–30; < Latin: sting, barb, equivalent to acu(s) needle + -leus noun suffix

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Aculeus is always a great word to know.

So is bezoar. Does it mean:

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.

a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.

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Collins

World English Dictionary

aculeus (əˈkjuːlɪəs)

—n
1.	a prickle or spine, such as the thorn of a rose
2.	a sting or ovipositor

[C19: from Latin, diminutive of acus needle]

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

a·cu·le·us