plural of split-ring

A ring of metal wire looped almost twice about, as a keyring. / (electronics) Either of a pair of concentric metallic rings with slits on opposite sides, used in split-ring resonators.

(physics) A metamaterial component composed of pair of concentric annular rings with splits in them at opposite ends. The rings are made of a nonmagnetic metal, such as copper, and have a small gap between them.

plural of split-ring resonator