generatrix

[jen-uh-rey-triks] /ˌdʒɛn əˈreɪ trɪks/
noun, plural generatrices
[jen-uh-rey-truh-seez, jen-er-uh-trahy-seez] /ˌdʒɛn əˈreɪ trəˌsiz, ˌdʒɛn ər əˈtraɪ siz/ (Show IPA). Mathematics
1.
generator (def 4b).
Origin
1830-40; < Latin generātrīx producer. See generate, -trix
British Dictionary definitions for generatrix

generatrix

/ˈdʒɛnəˌreɪtrɪks/
noun (pl) generatrices (ˈdʒɛnəˌreɪtrɪˌsiːz)
1.
a point, line, or plane that is moved in a specific way to produce a geometric figure
generatrix in Science
generatrix
  (jěn'ə-rā'trĭks)   
Plural generatrices (jěn'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.