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autotomy au·tot·o·my (ô-tŏt'ə-mē)
n.
The spontaneous casting off of a body part, especially of an invertebrate, when injured or under attack.
autotomy
the ability of certain animals to release part of the body that has been grasped by an external agent. A notable example is found among lizards that break off the tail when it is seized by a predator. The phenomenon is found also among certain worms, salamanders, and spiders. The cast-off part is sometimes regenerated
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