gen·er·a·trix /ˌʤɛnəˈretrɪks/
母點,母線,母面
Gen·er·a·trix n.; pl. L. Generatrices E. Generatrixes 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.
◄ ►