From Longman Dictionary of Contemporary Englishtweetertweet‧er /ˈtwiːtə $ -ər/ noun [countable] 1 TCBa speaker (=piece of equipment) through which the high sounds from a stereo etc are made louder → woofer2 someone who sends short messages using the social networking service Twitter
Examples from the Corpus
tweeter• The ribbon moves magnetically, reproducing the higher frequencies normally handled by a tweeter in a conventional speaker.• Tom left them, twined about with electrical wires, to set up their speakers and woofers and tweeters.• Vibrations in a dome tweeter, for instance, are delivered along the perimeter.• There is no standard woofer, no standard tweeter and no wooden cabinet.• A vent to the right, just above the tweeter, is an outlet for energy produced by the woofer. 