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waste product

American

noun

material discarded as useless in the process of producing something.
feces, urine, and other material excreted in the life process.

waste product Scientific

An unusable or unwanted substance or material produced during or as a result of a process, such as metabolism or manufacturing.

Etymology

Origin of waste product

First recorded in 1930–35

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Lucy Bell-Reeves, NPK Recovery's co-founder, said using a waste product to grow trees was "a circular solution that can revitalise our struggling native species."

From BBC • Apr. 2, 2026

The main solid waste product is phosphogypsum, which the plant discharges into the Mediterranean.

From Barron's • Oct. 10, 2025

The battery brining liquid is a hazardous waste product too and is trucked to another specialized facility, the agency said.

From Los Angeles Times • Apr. 9, 2025

And the primary waste product, called pomace, can be used as fertilizer, perhaps to grow new apple trees.

From Salon • Jul. 30, 2024

However they had gotten there, Spirit Lake was now their home, and their photosynthesis was creating oxygen as a waste product.

From "Mountain of Fire" by Rebecca E. F. Barone

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023