One of the mysteries of the English language finally explained.
Also with capital initial. Any of a group of alloys consisting largely of nickel and iron (typically between 35 and 48 per cent nickel), noted for their high magnetic permeability.
Biochemistry. A radioactive metallic element or atom.
1930s; earliest use found in Journal of Scientific Instruments. From radio- + metal. The alloys were apparently so named on account of their frequent use in transformer cores for radios<br>1960s. From radio- + metal.
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