breathalyzer

Etymology

Blend of breath + analyzer. Originally a trademark of Smith & Wesson.

noun

1. A device that measures alcohol in expired air so as to estimate the concentration of alcohol in a person's blood; used by traffic police in cases of suspected driving while under the influence of alcohol.
   During the three day class we took one day of classroom study followed by one day of operating the breathalyzer and one day of drinking. Yes, I said drinking. […] I hated it but I got it down long enough to take the breathalyzer test. I blew a .11 on the model 900A Breathalyzer. 2012, G. Douglas Ward, Memories of a Small-Town Cop, iUniverse, page 73