noun
a plural form of the noun 'aculeus', which refers to a sharp point or spine on a plant or animal
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The aculea of the cactus plant serve as a natural defense mechanism.
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Watch out for the aculea on that cactus, they can be pretty sharp.
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I accidentally pricked my finger on the aculea of the cactus.
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Her sharp words were like aculea, piercing through my defenses.