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1. (Botany) a prickle or spine, such as the thorn of a rose
2. (Zoology) a sting or ovipositor
[C19: from Latin, diminutive of acus needle]
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|Noun||1.||aculeus - a stiff sharp-pointed plant process|
|2.||aculeus - a sharp-pointed process especially a sting of a hymenopterous insect|
stinger - a sharp organ of offense or defense (as of a wasp or stingray or scorpion) often connected with a poison gland