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

  • n. An instrument for registering the depth and rapidity of respiratory movements.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. an instrument for measuring and recording the depth and rapidity of breathing movements

from the GNU version of the Collaborative International Dictionary of English

  • n. An instrument for recording the respiratory movements, as the sphygmograph does those of the pulse.

from The Century Dictionary and Cyclopedia

  • n. A device for drawing spirals.
  • n. Same as atmograph, 1.

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

  • n. a measuring instrument for recording the depth and rapidity of breathing movements


spiro- +‎ graph (Wiktionary)



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  • I had a spiro agnew graph — wasn't fun at all

    November 7, 2009

  • Spirograph is a registered trademark of Hasbro, Inc., for a geometric drawing toy.

    The Spirograph produces mathematical curves of the variety technically known as hypotrochoids and epitrochoids.

    The Spirograph was invented by British engineer Denys Fisher who exhibited it in 1965 at the Nuremberg International Toy Fair. It was subsequently produced by his company. Distribution rights were acquired by Kenner, Inc., which introduced it to the United States' market in 1966.


    February 12, 2008