In by Mark Goodman

A column of masonry, usually rectangular in horizontal cross-section, used to support other structural members.

Merriam-Webster Online Dictionary
pier (noun)
an intermediate support for the adjacent ends of two bridge spans
a structure (as a breakwater) extending into navigable water for use as a landing place or promenade or to protect or form a harbor
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
a structural mount (as for a telescope) usually of stonework, concrete, or steel
pier (Wikipedia)
Chelsea Piers, on the West Side of Manhattan, jutting into the Hudson River
A simple pier on Lake Mapourika in New Zealand
Canoeing floating dock pier in Ontario, Canada
Seaside pleasure pier in Brighton, England. The first seaside piers were built in England in the early 19th century.
Pier located in Monona, Wisconsin's "Stone Bridge Park" during a sunset over Lake Monona.

A pier is a raised structure in a body of water, typically supported by well-spaced piles or pillars. Bridges, buildings, and walkways may all be supported by piers. Their open structure allows tides and currents to flow relatively unhindered, whereas the more solid foundations of a quay or the closely spaced piles of a wharf can act as a breakwater, and are consequently more liable to silting. Piers can range in size and complexity from a simple lightweight wooden structure to major structures extended over 1600 metres. In American English, a pier may be synonymous with a dock.

Piers have been built for several purposes, and because these different purposes have distinct regional variances, the term pier tends to have different nuances of meaning in different parts of the world. Thus in North America and Australia, where many ports were, until recently, built on the multiple pier model, the term tends to imply a current or former cargo-handling facility. In Europe in contrast, where ports more often use basins and river-side quays than piers, the term is principally associated with the image of a Victorian cast iron pleasure pier. However, the earliest piers pre-date the Victorian age.

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