
Thorn
Part of Plant
Thorn specifically refers to sharp extensions on plants, not sharp objects in general.

Roses and cacti are common plants known for their thorns.
Painful Touch
Thorns can prick your skin, so approach with caution when dealing with thorny plants.

I accidentally pricked my finger on a thorn while gardening.
Natural Defense
Plants have thorns as a defense mechanism to protect from herbivores.

The thorns on that bush protect it from being eaten by animals.
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BarbNeedlePointPrickleQuillSpikeSpineThistle
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