from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An optical device (often a toy) used to produce a form of anamorphosis or to view distorted figures

from the GNU version of the Collaborative International Dictionary of English

  • n. An optical toy for producing amusing figures or pictures by means of two revolving disks, on one of which distorted figures are painted.

from The Century Dictionary and Cyclopedia

  • n. An instrument for producing a peculiar kind of optical illusion by means of two disks rotating rapidly one behind the other.


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