ethinyl
noun
ethi·nyl
e-ˈthī-nᵊl 
ˈe-thə-ˌnil
ˈe-thə-ˌnil
variants
or less commonly ethynyl
: a monovalent unsaturated radical HC≡C− derived from acetylene by removal of one hydrogen atom
Examples of ethinyl in a Sentence
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One environmental estrogen is ethinyl estradiol—a chemical found in birth control pills.
—
National Geographic, 3 Feb. 2016
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National Geographic, 3 Feb. 2016
Cite this Entry
“Ethinyl.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ethinyl. Accessed 14 Feb. 2026.
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