Other forms: by-products
A by-product is something extra produced while making the main thing. A useful by-product.
Some are sold and some have to be disposed of at a cost, and which is which changes. Gas was a by-product of coke making before anybody thought to light a street with it.
1nounby-productSomething extra produced while making the main thing.
“The heat was a by-product they piped to the swimming pool.”
by-product is a product.
Latin
prōductus
Middle English
product
English
product
English, today
by-product
From by- + product. product comes from Middle English product, from Latin prōductus. From Middle English product, from Latin prōductus, perfect participle of prōdūcō, first attested in English in the mathematics sense.
Etymology from Wiktionary, CC BY-SA