guard ring
noun
1.
a ring worn tightly in front of another ring to prevent the latter from slipping off the finger.
Origin
1810-20
Examples from the web for
guard ring
The
guard ring
is also included at the same voltage as the sensing plate in order to reduce fringe effects.
For minimal edge-effect field disturbance, a
guard ring
is generally placed around the upper plate.
British Dictionary definitions for
guard ring
guard ring
noun
1.
(
jewellery
)
Also called
guard,
keeper ring.
an extra ring worn to prevent another from slipping off the finger
2.
an electrode used to counteract distortion of the electric fields at the edges of other electrodes in a capacitor or electron lens