a guard at an airport who checks passengers or their luggage at a security checkpoint
"The screener waved me through after she quickly scanned my bag for any prohibited items."
One who, or that which, screens.
"The hiring manager asked me to act as a screener for all incoming resumes before they reached the interview stage."
A person employed to filter the mined coal through a metal screen to remove impurities.
"The tired screener finally stepped away from the vibrating machine after hours of separating the raw coal from stubborn rocks and debris."