bottle cap

noun

a device for closing or sealing a bottle, especially a metal cover with a cork gasket fitting tightly over the mouth of a glass or plastic bottle, held in place by crimping the edge of the cap over the lip or flange of the bottle.

Origin of bottle cap

An Americanism dating back to 1925–30

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018