Definition of “byword” - English Dictionary

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“byword” in American English

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bywordnoun [ C ]

us /ˈbɑɪˌwɜrd/

a name of a person or thing that is closely connected with a particular quality:

In Hollywood’s golden era, "Betty" was a byword for glamour.

(Definition of “byword” from the Cambridge Academic Content Dictionary © Cambridge University Press)