Definition of butyl
: any of four isomeric alkyl radicals C4H9− derived from butane
Recent Examples of butyl from the Web
Butyl urea slows the formation of those H-bonds, preventing curl.
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Origin and Etymology of butyl
International Scientific Vocabulary butyric + -yl
First Known Use: 1850
Medical Definition of butyl
: any of four isomeric monovalent radicals C4H9 derived from butanes
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