Englishfor English speakers
d
Noun
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The fourth letter of the alphabet.
"c" comes before "d"
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In some schools, an D is a poor grade.
Liam did not pass this exam because he got a D.
t
Noun
—
The twentieth (20th) letter of the alphabet. It is the second most used letter, after e.
"t" comes after "s" and before "u"
reactor
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noun
an electrical device used to introduce reactance into a circuit
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noun
(= nuclear reactor)
(physics) any of several kinds of apparatus that maintain and control a nuclear reaction for the production of energy or artificial elements