Longman Dictionary of Contemporary English
WordNet
n. a circular ring of metal for holding keys
Wikipedia
Key Ring is a smartphone application owned by Gannett, Inc. that allows users to digitally store loyalty cards, enroll in new loyalty programs, receive localized offers on their smartphone, browse weekly sales circulars, and create digital shopping lists.
Usage examples of "key ring".
The guard, wild, grabbed for the sergeant's key ring, but the sergeant slapped him down.
Frank agreed, ambling inside and twirling the key ring on his finger.
He unlocked the car with the automatic lock release on the key ring and they got in.
Look, I've got a can of pepper spray in my purse and a whistle on my key ring.
Beside the box was the ransom note, key ring, driver's license, pen, even the crumpled pieces of torn newspaper that had been used for packing.