| Meaning | A substance that exerts some force or effect. |
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| Narrower | antacid, gastric antacid, alkalizer, alkaliser, antiacid | An agent that counteracts or neutralizes acidity (especially in the stomach) |
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| antiflatulent | Any agent that reduces intestinal gas |
| antifungal, antifungal agent, fungicide, antimycotic, antimycotic agent | Any agent that destroys or prevents the growth of fungi |
| bacteriostat | A chemical or biological material that inhibits bacterial growth |
| bleaching agent, bleach, blanching agent, whitener | An agent that makes things white or colorless |
| chemical agent | An agent that produces chemical reactions |
| coagulant, coagulator | An agent that produces coagulation |
| coolant | A fluid agent (gas or liquid / liquid) that produces cooling |
| dilutant, diluent, thinner | A diluting agent |
| disinfectant, germicide, antimicrobic, antimicrobial | An agent (as heat or radiation or a chemical) that destroys microorganisms that might carry disease |
| drug | A substance that is used as a medicine or narcotic |
| emmenagogue | Any agent that promotes menstrual discharge |
| galactagogue | agent that induces milk secretion |
| hypnagogue | An agent that induces drowsiness or sleep |
| hypoglycemic agent, hypoglycaemic agent | Any of various agents that decrease the level of glucose in the blood and are used in the treatment of diabetes mellitus |
| inducer | An agent capable of activating specific genes |
| lactifuge | Any agent that reduces milk secretion (as given to a woman who is not breast feeding) |
| lactogen | Any agent that enhances milk production |
| mitogen | An agent that triggers mitosis |
| nerve gas, nerve agent | A toxic gas that is inhaled or absorbed through the skin and has harmful effects on the nervous and respiratory system |
| precipitant | An agent that causes a precipitate to form |
| solvating agent | An agent that converts something into a solvate |
| vermicide | An agent that kills worms (especially those in the intestines) |
| viricide, virucide | An agent (physical or chemical) that inactivates or destroys viruses |
| Broader | causal agent, cause, causal agency | Any entity that produces an effect or is responsible for events or results |
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| substance | A particular kind or species of matter with uniform properties |
| Spanish | agente |
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| Catalan | agent |
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