Longman Dictionary of Contemporary English homepage

conductor

noun
     
con‧duc‧tor [countable]
1APM someone who stands in front of a group of musicians or singers and directs their playing or singing
2 British EnglishTT someone whose job is to collect payments from passengers on a bus
3 American EnglishTTT someone who is in charge of a train and collects payments from passengers or checks their tickets [= guard British English]
4HP something that allows electricity or heat to travel along it or through it:
Wood is a poor conductor of heat.
lightning conductor

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