coumarin
noun
cou·ma·rin
ˈkü-mə-rən 
: a toxic white crystalline lactone C9H6O2 with an odor of new-mown hay found in plants or made synthetically and used especially in perfumery and as a parent compound in anticoagulant agents
also
: a derivative of this compound
Examples of coumarin in a Sentence
Recent Examples on the Web
But Quattrocchi, who was not affiliated with the study, warned that coumarin can cause liver damage with excessive use.
—
Amy McGorry, FOXNews.com, 12 May 2025
Ceylon cinnamon may also have trace amounts of coumarin.
—Katia Hetter, CNN Money, 8 May 2025
Ageratum is an annual flower that secretes coumarin (used in commercial mosquito repellents), which has an odor that mosquitoes can’t stand.
—Clarence Schmidt, San Diego Union-Tribune, 11 Apr. 2024
Alongside is a sidecar of vanilla-tonka bean maple syrup, heady with the almond-y, fresh-hay scent of coumarin — a naturally occurring chemical in the seeds of the kumaru tree.
—Stephanie Breijo, Los Angeles Times, 3 Nov. 2024
In any case, chamomile flowers—which look like adorable, tiny daisies—contain flavonoids, terpenoids, and coumarins which certainly have mildly sedative, anti-inflammatory, and antispasmodic properties.
—Valentina Bottoni, Vogue, 23 Oct. 2024
Some cassia cinnamon products contain high levels of coumarin, a substance that can be harmful to the liver.
—Johna Burdeos, Health, 21 Oct. 2024
This is due to the spice's high concentration of anti-inflammatory and antioxidant compounds like coumarin, cinnamic acid, cinnamaldehyde, and eugenol.19
Cinnamon tea can be made with ground cinnamon or cinnamon sticks.
—Jillian Kubala, Health, 16 July 2024
Sweet, vanilla-scented coumarin is found in cinnamon.
—Popular Science, 31 Aug. 2023
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Amy McGorry, FOXNews.com, 12 May 2025
Ceylon cinnamon may also have trace amounts of coumarin.
—Katia Hetter, CNN Money, 8 May 2025
Ageratum is an annual flower that secretes coumarin (used in commercial mosquito repellents), which has an odor that mosquitoes can’t stand.
—Clarence Schmidt, San Diego Union-Tribune, 11 Apr. 2024
Alongside is a sidecar of vanilla-tonka bean maple syrup, heady with the almond-y, fresh-hay scent of coumarin — a naturally occurring chemical in the seeds of the kumaru tree.
—Stephanie Breijo, Los Angeles Times, 3 Nov. 2024
In any case, chamomile flowers—which look like adorable, tiny daisies—contain flavonoids, terpenoids, and coumarins which certainly have mildly sedative, anti-inflammatory, and antispasmodic properties.
—Valentina Bottoni, Vogue, 23 Oct. 2024
Some cassia cinnamon products contain high levels of coumarin, a substance that can be harmful to the liver.
—Johna Burdeos, Health, 21 Oct. 2024
This is due to the spice's high concentration of anti-inflammatory and antioxidant compounds like coumarin, cinnamic acid, cinnamaldehyde, and eugenol.19
Cinnamon tea can be made with ground cinnamon or cinnamon sticks.
—Jillian Kubala, Health, 16 July 2024
Sweet, vanilla-scented coumarin is found in cinnamon.
—Popular Science, 31 Aug. 2023
Cite this Entry
“Coumarin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/coumarin. Accessed 22 May. 2025.
Copy CitationMedical Definition
coumarin
noun
cou·ma·rin
ˈkü-mə-rən
: a toxic white crystalline lactone C9H6O2 with an odor of new-mown hay found in plants or made synthetically and used especially in perfumery and as the parent compound in various anticoagulant agents (as warfarin)
also
: a derivative of this compound
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