Definition

(noun) 1. a fence or enclosure set in a waterway for taking fish

2. a dam in a stream or river to raise the water level or divert its flow

In Context

Without the weir, the ocean tides could flow in and out, creating a predominantly saltwater system.”

Phil Diehl, sandiegouniontribune.com, “Decision on Buena Vista Lagoon project likely delayed until summer,” 22 Apr. 2018