| bacteriostat | (noun) a chemical or biological material that inhibits bacterial growth | - |
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| coelostat | (noun) optical device used to follow the path of a celestial body and reflect its light into a telescope; has a movable and a fixed mirror | - |
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| cryostat | (noun) a thermostat that operates at very low temperatures | - |
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| haemostat | (noun) a surgical instrument that stops bleeding by clamping the blood vessel | Synonyms: hemostat |
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| hemostat | (noun) a surgical instrument that stops bleeding by clamping the blood vessel | Synonyms: haemostat |
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| photostat | (noun) a photocopy made on a Photostat machine | - |
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| (verb) make a copy by means of a Photostat device | - |
| pyrostat | (noun) a thermostat that operates at very high temperatures | - |
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| rheostat | (noun) resistor for regulating current | Synonyms: variable resistor |
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| thermostat | (noun) a regulator for automatically regulating temperature by starting or stopping the supply of heat | Synonyms: thermoregulator |
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| (verb) control the temperature with a thermostat | - |