*hpi*

n. [ AS. lynis the axletree; akin to D. luns linchpin, OS. lunisa, LG. lunse, G. lünse, OHG. lun peg, bolt. ] A pin used to prevent the wheel of a vehicle from sliding off the axletree. [ 1913 Webster ]

n. 1. 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. [ 1913 Webster ]

2. An appendage to an inlet or outlet opening of a pipe or vessel, to direct or facilitate the inflow or outflow of a fluid. [ 1913 Webster ]

3. One who delivers the opinion of others or of another; a spokesman; as, the mouthpiece of his party. [ 1913 Webster ]

Egmont was imprudent enough to make himself the mouthpiece of their remonstrance. Motley. [ 1913 Webster ]

4. Hence: A person's lawyer. [ slang ] This is a term that was used sometimes in old movies. When a tough bad guy was arrested he might say “I ain't sayin' nothin' without my mouthpiece!” [ PJC ]

n. A child's game played with pins. L. Estrange. [ 1913 Webster ]

n. (Far.) A disease of the hock (sometimes of the knee) of a horse, caused by inflammation of the synovial membrane and a consequent excessive secretion of the synovial fluid; -- probably so called because there is usually an oval swelling on each side of the leg, appearing somewhat as if a pin had been thrust through. [ 1913 Webster ]

n. A pointed instrument for clearing the teeth of substances lodged between them. [ 1913 Webster ]