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Definition of carrier pigeon noun from the Oxford Advanced Learner's Dictionary

carrier pigeon

noun
 
/ˈkæriə pɪdʒɪn/
 
/ˈkæriər pɪdʒɪn/
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  1. a pigeon (= a type of bird) that has been trained to carry messagesTopics Birdsc2
See carrier pigeon in the Oxford Advanced American Dictionary
biodegradable
adjective
 
 
From the Topic
The environment
C1
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