conductor

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con|duc|tor /kənd'ʌktər/ (conductors)
1 [N-COUNT]
A conductor is a person who stands in front of an orchestra or choir and directs its performance.
2 [N-COUNT]
On a bus, the conductor is the person whose job is to sell tickets to the passengers.
3 [N-COUNT]
On a train, a conductor is a person whose job is to travel on the train in order to help passengers and check tickets. (AM; in BRIT, use guard)
4 [N-COUNT]
A conductor is a substance that heat or electricity can pass through or along.
see also lightning conductor, semiconductorlight|ning con|duc|tor (lightning conductors)
[N-COUNT]
A lightning conductor is a long thin piece of metal on top of a building that attracts lightning and allows it to reach the ground safely. (BRIT; in AM, use lightning rod)

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