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spirograph

Noun

spi=ro=graph

WORDNET DICTIONARY

spirograph(n = noun.artifact) - a measuring instrument for recording the depth and rapidity of breathing movements;

spirograph, n. [L. spirare to breathe + -graph.].

An instrument for recording the respiratory movements, as the sphygmograph does those of the pulse. [1913 Webster]

spirograph, n. an instrument for recording breathing movements.

Derivative

spirographic adj. spirographically adv.

For further exploring for "spirograph" in Webster Dictionary Online