guard ring


noun

a ring worn tightly in front of another ring to prevent the latter from slipping off the finger.

Origin of guard ring

First recorded in 1810–20

British Dictionary definitions for guard ring

guard ring

noun

Also called: guard, keeper ring jewellery an extra ring worn to prevent another from slipping off the finger
an electrode used to counteract distortion of the electric fields at the edges of other electrodes in a capacitor or electron lens