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dopant
'dopant' - used as a noun
1. something added in trace amounts to a semiconductor to produce the desired electrical properties
 
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There is only one difference between a long life and a good dinner: that, in the dinner, the sweets come last. - Click here to find out.
Fact of the day
Before soccer referees started using whistles in 1878, they used to rely on waving a handkerchief.