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aculeus

[uh-kyoo-lee-uh s] /əˈkyu li əs/
noun, plural aculei
[uh-kyoo-lee-ahy] /əˈkyu liˌaɪ/ (Show IPA)
1.
Also, acus. the modified ovipositor or sting of certain hymenopterous insects.
2.
prickle (def 2).
Origin
1820-1830
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. 2014.
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British Dictionary definitions for aculei

aculeus

/əˈkjuːlɪəs/
noun
1.
a prickle or spine, such as the thorn of a rose
2.
a sting or ovipositor
Word Origin
C19: from Latin, diminutive of acus needle
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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