Thorn

usgb/θɔːrn/Volume
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Part of PlantPlay
Thorn specifically refers to sharp extensions on plants, not sharp objects in general. SlideRoses and cacti are common plants known for their thorns.
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Painful TouchPlay
Thorns can prick your skin, so approach with caution when dealing with thorny plants. SlideI accidentally pricked my finger on a thorn while gardening.
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Natural DefensePlay
Plants have thorns as a defense mechanism to protect from herbivores. SlideThe thorns on that bush protect it from being eaten by animals.