Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “by-product”


noun [C]     /ˈbaɪˌprɒd.ʌkt/ US  /-ˌprɑː.dəkt/
something that is produced as a result of making something else , or something unexpected that happens as a result of something: Buttermilk is a by-product of making butter . Illness is one of the by-products of overcrowded housing .Outcomes and consequencesProducts and producersBuying and selling in general
(Definition of by-product noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of by-product

Definitions of “by-product” in other dictionaries

Word of the Day

prenuptial agreement

an official document signed by two people before they get married that says what will happen to their possessions and/or children if they divorce (= officially stop being married)

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More