[pier] n [ME per, fr. OE, fr. ML pera] (12c) 1: an intermediate support for the adjacent ends of two bridge spans
2: a structure (as a breakwater) extending into navigable water for use as a landing place or promenade or to protect or form a harbor
3: a vertical structural support: as a: the wall between two openings b: pillar, pilaster c: a vertical member that supports the end of an arch or lintel d: an auxiliary mass of masonry used to stiffen a wall
4: a structural mount (as for a telescope) usu. of stonework, concrete, or steel