birdbrainnoun [ C usually singular ]uk /ˈbɜːd.breɪn/ us /ˈbɝːd.breɪn/ mainly US informal
adjective uk /ˈbɜːd.breɪnd/ us /ˈbɝːd.breɪnd/ mainly US informal
(Definition of “birdbrain” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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a delicate, soft type of cloth made from a thread produced by silkworms, or the thread itself