generatrix

noun, plural gen·er·a·tri·ces [jen-uh-rey-truh-seez, jen-er-uh-trahy-seez] /ˌdʒɛn əˈreɪ trəˌsiz, ˌdʒɛn ər əˈtraɪ siz/. Mathematics.

noun plural generatrices (ˈdʒɛnəˌreɪtrɪˌsiːz)

a point, line, or plane that is moved in a specific way to produce a geometric figure

Plural generatrices (jĕn′ə-ə-rā′trĭ-sēz′, -ər-ə-trī′sēz)

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