One of the mysteries of the English language finally explained.
1Of, relating to, or using radioactivity. rare.
2Of, relating to, or practising radionics as a form of alternative medicine.
Of, relating to, or using electronics, especially in connection with radio technology.
Early 20th century; earliest use found in The Lancet. From radio- + -onic, in sense 2 after radionics<br>1940s; earliest use found in Radio News. From radio- + -onic.
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