Longman Dictionary of Contemporary English homepage

semiconductor

 noun
     
Related topics: Chemistry, Electricity
sem‧i‧con‧duc‧tor [countable]
HPE a substance, such as silicon, that allows some electric currents to pass through it, and is used in electronic equipment
—semiconducting adjective [only before noun]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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