dop·ant

[doh-puhnt]
noun Electronics.
an impurity added intentionally in a very small, controlled amount to a pure semiconductor to change its electrical properties: Arsenic is a dopant for silicon.

Origin:
1960–65; dope + -ant

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dopant (ˈdəʊpənt) [Click for IPA pronunciation guide]
 
n
an element or compound used to dope a semiconductor
 
[C20: see dope, -ant]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Dopant is always a great word to know.
So is ort. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a scrap or morsel of food left at a meal.
Example sentences
These phenomena can be accounted for if chemical processes in the gas phase, which involve the dopant, are considered.
The absence of photochemical activity may result from dopant-induced trap and/or recombination sites within the film.
Some dopant gases that are used include arsine, phosphine, and diborane.
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