Meaning of “E number” in the English Dictionary

british dictionary

"E number" in British English

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E numbernoun [ C ]

uk /ˈiː ˌnʌm.bər/ us /ˈiː ˌnʌm.bɚ/

any of a set of numbers with the letter E in front of them that are used on containers of food in the European Union to show which particular approved chemical has been added to the food

(Definition of “E number” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)