| Word | Definitions | Synonyms |
|---|---|---|
| butyl | (noun) a hydrocarbon radical (C4H9) | - |
| butylate | (verb) introduce the butyl group into a chemical compound | - |
| butylene | (noun) any of three isomeric hydrocarbons C4H8; all used in making synthetic rubbers | Synonyms: butene |
| isobutylene | (noun) used also in making gasoline components | - |
| polybutylene | (noun) a polymer of butylene; used in lubricants and synthetic rubber | Synonyms: polybutene |