What is "glissette"

Glissette \Glis*sette"\, n. [F., fr. glisser to slip.] (Math.) The locus described by any point attached to a curve that slips continuously on another fixed curve, the movable curve having no rotation at any instant.

n. (context mathematics English) The locus described by any point attached to a curve that moves continuously along another fixed curve, the movable curve having no rotation at any instant.