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a trademark for a device that analyzes exhaled air. It is commonly used to test for blood alcohol levels; the test is based on the relationship between alcohol in the breath and alcohol in the blood circulating through the lungs. Also spelled Breathalyser.


Public health A device used to detect alcohol on a suspected drunk driver's breath; see DWI.
References in periodicals archive ?
The results of a preliminary breath test administered by police showed his blood-alcohol level to be 0.
A preliminary breath test showed that the elder McCarthy's blood-alcohol level was above the .
He also admitted driving while unfit due to alcohol after a preliminary breath test showed he had just over twice the legal amount of alcohol in his breath.
A preliminary breath test taken at the scene showed that Lopez had a blood alcohol level of 0.

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