From Longman Dictionary of Contemporary Englishteabagtea‧bag /ˈtiːbæɡ/ noun [countable] 
DFDa small paper bag with tea leaves inside, used for making tea
DFDa small paper bag with tea leaves inside, used for making teaExamples from the Corpus
teabag• Could there possibly be a last antique teabag in the cupboard over the sink?• Babes on a budget should try used, cold teabags instead.• The new brew is made from a specially developed teabag version of Brooke Bond Choicest Blend.• Meg has lost so much weight her bosoms look like a pair of pyramid teabags, but really this is his movie.• Its share of the regional teabag market rose from 11 to 15 percent.• During the discussions, many participants said they could not accept that round teabags were in any way superior.• Take, for example, the case of the round teabag, a commercial victory that owed almost everything to research.• Round teabags sold extremely well in this test. 