generatrix

noun
gen·er·a·trix | \ ˌje-nə-ˈrā-triks \
plural generatrices\ˌje-nə-ˈrā-trə-ˌsēz, ˌje-nə-rə-ˈtrī-(ˌ)sēz \

Definition of generatrix 

: a point, line, or surface whose motion generates a line, surface, or solid

First Known Use of generatrix

1840, in the meaning defined above

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The first known use of generatrix was in 1840

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