Lewis & Short

cervīcŭla, ae, f. dim. [cervix].

  1. I. A small neck, * Cic. Verr. 2, 3, 19, § 49; App. Flor. p. 348: contracta, Quint. 11, 3, 180.
  2. * II. In mechanics, the neck of a hydraulic machine, Vitr. 10, 8, 2.