Webster's English Dictionary

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pier

pier \'pi(*)r\ n [ME per, fr. OE, fr. ML pera] 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  3a: the 
   wall between two openings  3b: PILLAR, PILASTER  3c: a vertical member that 
   supports the end of an arch or lintel  3d: an auxiliary mass of masonry 
   used to stiffen a wall  4: a structural mount usu. of stonework, concrete, 
   or steel