[1] : The Collaborative International Dictionary of English v.0.48

generatrix \gen`era"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.
   generic
see also:
generatrices generatrixes describent 

[2] : WordNet (r) 2.0

generatrices
     see generatrix
see also:
generatrix 

Generatrices >> G Words
Generatrices, definition of term: Generatrices
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