noun
a plural form of aculeus, which refers to a small, sharp, needle-like structure or spine found on certain animals such as insects or plants
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The aculei on the cactus plant serve as a defense mechanism against herbivores.
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Ouch! I accidentally touched one of the aculei on the cactus.
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I hate it when I get pricked by those dang aculei on the succulents.
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Her sharp words were like aculei, piercing through his defenses.