Definition of flex-fuel in English:

flex-fuel

Syllabification: flex-fu·el
Pronunciation: /ˈfleksˌfyo͞o(ə)l/

Entry from US English dictionary

adjective

Denoting a motor vehicle that will run on gasoline, ethanol, or these two in any combination: flex-fuel subcompacts have captured 20% of Brazil’s new car market

Definition of flex-fuel in:

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Word of the day impudicity
Pronunciation: ˌɪmpjʊˈdɪsɪti
noun
lack of modesty