| chem | a representation of a substance using symbols for its constituent elements |
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| chem | (chemistry) two or more atoms bound together as a single unit and forming part of a molecule |
| chem | a manufacturer of chemicals |
| chem | a substance producing irritation |
| chem | (trademark) a liquid that temporarily disables a person |
| chem | the atomic process that occurs during a chemical reaction |
| chem | a notation used by chemists to express technical facts in chemistry |
| chem | warfare using chemical agents to kill or injure or incapacitate the enemy |
| chem | (chemistry) any natural phenomenon involving chemistry (as changes to atoms or molecules) |
| chem | an industrial plant where chemicals are produced |
| chem | (chemistry) any process determined by the atomic and molecular composition and structure of the substances involved |
| chem | a property used to characterize materials in reactions that change their identity |