This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A geometric element that generates a geometric figure, especially a straight line that generates a surface by moving in a specified fashion. Also called generator.

n. A curve that, when rotated about an axis, produces a solid figure

n. 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.

n. In mathematics, that which generates; specifically, the point, line, or figure which by its motion is conceived to generate a line, surface, or solid.

n. In physics, a dynamo-electric machine employed to generate an electric current. Compare receptrix.

"In each of these cases, it would be unreasonable to expect the protagonist to be the generator or generatrix, in this case of the action of the scene."

describent