someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous); speaker, utterer, verbalizer, verbaliser
the speaker at commencement
an utterer of useful maxims
Microsoft Computer Dictionary
n. An Internet-based synchronous communication mechanism most commonly used to support multiuser chat functions. Such systems typically provide specific commands for movement through separate rooms, or chat areas, and allow users to communicate with other users in real time through text messages, indicate simple gestures, use a bulletin board system (BBS) for posting comments, and send internal e-mail. See also BBS (definition 1), chat (definition 1).