Thorn

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1. one of various sharp and pointed outgrowths of plants that can arise from stems, leaves, or fruits; botanically, a modified twig which has tiny leaf scars and buds and is usually pointed and sharp; other sharp structures are prickles and spines which are technically different from thorns and each other, but which have the same overall effect.
2. pointed modification of a stem.

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A thorn is a modified stem.
Source: http://www.eeob.iastate.edu/classes/botany306/terminology/vegetative/stems.html