| NOUN | substance | butylene, butene | any of three isomeric hydrocarbons C4H8 |
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| Meaning | Any of three isomeric hydrocarbons C4H8; all used in making synthetic rubbers. | |
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| Synonym | butene | |
| Narrower | isobutylene | Used also in making gasoline components |
| polybutylene, polybutene | A polymer of butylene | |
| Broader | gas | A fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely |
| Spanish | buteno, butileno | |
| Catalan | butè, butilè | |
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