Definitions for "Spirograph"
a curve formed by rolling a circle inside or outside of another circle
a tracing toy
Spirograph is a trademark of Hasbro, Inc., for a geometric drawing toy, which produces mathematical curves of the variety technically known as hypotrochoids and epitrochoids. The word has also been applied to a variety of software applications that display similar curves.
An instrument for recording the respiratory movements, as the sphygmograph does those of the pulse.
a measuring instrument for recording the depth and rapidity of breathing movements