noun, plural aculei [uh-kyoo-lee-ahy] .
Also, acus. the modified ovipositor or sting of certain hymenopterous insects.
prickle ( def 2 ).

1820–30; < Latin: sting, barb, equivalent to acu(s) needle + -leus noun suffix Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
aculeus (əˈkjuːlɪəs)
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
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Example sentences
Aculeus length was measured including the part extended inside the eversible membrane.
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