Definition of female gauge in US English:

female gauge

(US female gage)

noun

rare
  • 1A notch or slot designed to receive a projection or peg and so control the position of a mechanism.

  • 2A gauge designed to fit around the exterior of an object whose size is to be tested or measured.

Origin

Late 17th century; earliest use found in Joseph Moxon (1627–1691), printer and globe maker.