peroxisome

noun

per·​ox·​i·​some pə-ˈräk-sə-ˌsōm How to pronounce peroxisome (audio)
: a cytoplasmic cell organelle containing enzymes (such as catalase) which act in oxidative reactions and especially in the production and decomposition of hydrogen peroxide
peroxisomal adjective

Examples of peroxisome in a Sentence

Recent Examples on the Web
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Suresh Subramani, a molecular biologist who specializes in the study of peroxisomes, tiny membranes that play a crucial role in human health, notably by breaking down fatty acids and neutralizing toxic substances in the body. Gary Robbins, San Diego Union-Tribune, 7 May 2025

Word History

Etymology

peroxide + -some entry 3

First Known Use

1965, in the meaning defined above

Time Traveler
The first known use of peroxisome was in 1965

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Cite this Entry

“Peroxisome.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/peroxisome. Accessed 18 May. 2025.

Medical Definition

peroxisome

noun
per·​ox·​i·​some pə-ˈräk-sə-ˌsōm How to pronounce peroxisome (audio)
: a cytoplasmic cell organelle containing enzymes (as catalase) which act especially in the production and decomposition of hydrogen peroxide

called also microbody

peroxisomal adjective

More from Merriam-Webster on peroxisome

Last Updated: - Updated example sentences
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