The Collaborative International Dictionary
Ellipsograph
Ellipsograph \El*lip"so*graph\, n. [Ellipse + graph: cf. F. ellipsographe.] An instrument for describing ellipses; -- called also trammel.
Wiktionary
ellipsograph
n. A mechanical instrument used to trace out an ellipse. Applied to draw, cut, etc mathematically correct ellipses (rather than general ovals).
Usage examples of "ellipsograph".
Compasses, T-squares, rulers, protractors, and ellipsographs obeyed the touch of his fingers as if inspired with life.