1. (n.) The part of a musical or other instrument to which the mouth is applied in using it; as, the mouthpiece of a bugle, or of a tobacco pipe.

2. (n.) An appendage to an inlet or outlet opening of a pipe or vessel, to direct or facilitate the inflow or outflow of a fluid.

3. (n.) One who delivers the opinion of others or of another; a spokesman; as, the mouthpiece of his party.

AG DA KC QC SSC US attorney adviser advocate aerophone agent amicus curiae announcer annunciator attorney attorney general attorney-at-law authority barrister barrister-at-law bell bit call box channel civilian coin telephone communicant communicator connection corporation lawyer counsel counselor counselor-at-law court-appointed lawyer criminal lawyer defense counsel delegate deputy desk telephone dial telephone district attorney double reed embouchure enlightener expert witness extension friend at court front front man go-between gossipmonger grapevine herald horn informant information center information medium informer interagent interceder intercessor intermediary intermediate intermediate agent intermediator intermedium internuncio intervener interventionist interventor interviewee junior counsel key law agent lawyer leader legal adviser legal counselor legal expert legal practitioner legalist lip mediator medium middleman monitor mouth negotiant negotiator negotiatress negotiatrix newsmonger notifier official spokesman ombudsman pay station phone pipe pleader press private attorney proctor procurator prolocutor prolocutress prolocutrix prosecuting attorney prosecutor public prosecutor public relations officer public telephone publicist publisher push-button telephone radio rapporteur receiver reed reporter representative sea lawyer self-styled lawyer shyster silk silk gown slide solicitor solicitor general source speaker special pleader spokesman spokesperson spokeswoman stuff gown stuff-gownsman telephone telephone booth telephone engineering telephone extension telephone mechanics telephone receiver telephonics telephony television teller tipster tooter tout transmitter valve voice wall telephone wind wind instrument witness