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From The Collaborative International Dictionary of English v.0.48:
Zoetrope \Zo"e*trope\, n. [Gr. ? life + ? turning, from ? to turn.] An optical toy, in which figures made to revolve on the inside of a cylinder, and viewed through slits in its circumference, appear like a single figure passing through a series of natural motions as if animated or mechanically moved. [1913 Webster]