Longman Dictionary of Contemporary English homepage

quadruple

2 adjective, predeterminer
     
Related topics: Numbers
quadruple2
1B four times as big or as many [↪ double, triple]:
The subjects were given quadruple the normal dosage of the drug.
2DHMN involving four things of the same kind:
a quadruple murder
Definition from the Longman Dictionary of Contemporary English
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