Grounded, connected electrically to the ground.(adjective)
Simple past tense and past participle of earth.(verb)
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Use "earthed" in a sentence
"-- To obtain great elevations a fine wire (piano wire 1/32 inch in diameter) is generally used, but to protect the user against electric shocks the wire must be connected with an "earthed" terminal, on the principle of the lightning conductor."
"A, and the whole of the inside and outside of the tube walls are coated with metal, D, D, and "earthed" so as to carry away the positive electricity as rapidly as possible, then it is seen that the molecules leaving the negative pole and striking upon the idle pole,"
"During strong magnetic periods she has been advised to grip the kitchen taps as they are 'earthed'."