Spirograph
Pronunciation : Spi"ro*graph
Part of Speech : n.
Etymology : [L. spirare to breathe + -graph.] (Physiol.)
Definition : Defn: An instrument for recording the respiratory movements, as the sphygmograph does those of the pulse.
Source : Webster's Unabridged Dictionary, 1913
Merriam-Webster's Everyday Language Reference Set: Includes: The Merriam-Webster Dictionary, The Merriam-Webster Thesaurus, and The Merriam-Webster Vocabulary Builder