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Spirograph vs Spirography - What's the difference?

spirograph | spirography |

As a proper noun spirograph

is a geometric drawing toy consisting of a set of plastic gears and toothed rings.

As a noun spirography is

(medicine) the measurement of breathing movements.

spirograph

English

Noun

(en noun)
  • (medicine) an instrument for measuring and recording the depth and rapidity of breathing movements

    • Related terms

    *spirogram

    spirography

    English

    Noun

    (-)
  • (medicine) The measurement of breathing movements.

    • Related terms

    * spirogram * spirograph