Meaning

noun a platform built out from the shore into the water and supported by piles; provides access to ships and boats

noun (architecture) a vertical supporting structure (as a portion of wall between two doors or windows)

noun a support for two adjacent bridge spans

originA Middle English vernacular form of Peter, from Old French Piers, from Latin Petrus. Doublet of Pedro, Peter, and Boutros.

Etymology from Wiktionary, CC BY-SA 3.0