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.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'butyl.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Origin and Etymology of butyl
International Scientific Vocabulary butyric + -yl
First Known Use: 1850See Words from the same year
Medical Definition of butyl
: any of four isomeric monovalent radicals C4H9 derived from butanes
Seen and Heard
What made you want to look up butyl? Please tell us where you read or heard it (including the quote, if possible).