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The Collaborative International Dictionary
describent

Generatrix \Gen`er*a"trix\, n.; pl. L. Generatrices, E. Generatrixes. [L.] (Geom.) That which generates; the point, or the mathematical magnitude, which, by its motion, generates another magnitude, as a line, surface, or solid; -- called also describent.

Wiktionary
describent

n. (context geometry English) A generatrix.