from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The streaming rotary motion of protoplasm within certain cells and one-celled organisms.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. the circulation of protoplasm within a cell

from the GNU version of the Collaborative International Dictionary of English

  • n. The circulation or movement of protoplasmic granules within a living vegetable cell.

from The Century Dictionary and Cyclopedia

  • n. In zoöl., physiol., and botany, circulation, as of blood or other fluid: in zoölogy, especially applied to the currents in which circulate the finely granular protoplasmic substances in Protozoa, Infusoria, etc., as within the body of members of the genus Paramecium, and the pseudopods of foraminifers; in botany, originally, to the movement occasionally observable in the latex of plants, now to the streaming movement of protoplasm within the cell.
  • n. In physical, the existence of cycles.
  • n. In mathematics, the occurrence of closed paths.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the circulation of cytoplasm within a cell


New Latin, from Greek kuklōsis, a surrounding, from kukloun, to surround, from kuklos, circle; see kwel-1 in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)


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  • I like this one from The Century Dictionary and Cyclopedia: "In mathematics, the occurrence of closed paths."

    October 16, 2015