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1. (Jewellery) jewellery Also called: guard or keeper ring an extra ring worn to prevent another from slipping off the finger
2. (General Physics) an electrode used to counteract distortion of the electric fields at the edges of other electrodes in a capacitor or electron lens
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014