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butyl US English

An alkyl radical —C4H9, derived from butane

butyl alcohol US English

Any of four isomeric alcohols used as solvents and in organic synthesis

butyl rubber US English

A synthetic rubber made by polymerizing isobutylene and isoprene

1-butyl-3-tosylurea in tolbutamide US English

A synthetic compound used to lower blood sugar levels in the treatment of diabetes