undecylenic acid
noun
un·dec·y·le·nic acid
ˌən-ˌde-sə-ˈle-nik- 
-ˈlē-
-ˈlē-
: a fatty acid C11H20O2 found in perspiration, obtained commercially from castor oil, and used especially in the treatment of fungal infections (such as ringworm) of the skin
Cite this Entry
“Undecylenic acid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/undecylenic%20acid. Accessed 6 Jul. 2026.
Copy CitationMedical Definition
undecylenic acid
noun
un·dec·y·le·nic acid
ˌən-ˌdes-ə-ˌlen-ik-
-ˌlēn-
-ˌlēn-
: an acid C11H20O2 found in perspiration, obtained commercially from castor oil, and used in the treatment of fungus infections (as ringworm) of the skin
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