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Definitions

molecule

[mol-uh-kyool] / ˈmɒl əˌkyul /


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.

That causes the molecule to crack into hydrogen and ethylene, the basic building block of plastics such as polyethylene.

From The Wall Street Journal • Apr. 5, 2026

Over time, she identified two promising ingredients: forms of taurine, an organic compound commonly sold as a dietary supplement, and ethanolamine, another simple organic molecule.

From Science Daily • Mar. 26, 2026

Their combined insights highlight a growing global effort to understand how this small molecule may support healthier aging and help protect against conditions like Alzheimer's and Parkinson's disease.

From Science Daily • Mar. 24, 2026

"We don't want side effects arising from poor-quality medicines and giving the molecule itself a bad name."

From BBC • Mar. 17, 2026

By the early 1940s, biochemists had broken cells apart to reveal their chemical constituents and identified various molecules in living systems—but the molecule that carried the code of heredity was still unknown.

From "The Gene" by Siddhartha Mukherjee