Webster's English Dictionary

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weir

weir \'wa(*)r, 'we(*)r, 'wi(*)r\ n [ME were, fr. OE wer; akin to ON ver 
   fishing place, OHG we]rien, werren to defend, L aperire to open, operire to 
   close, cover 1: a fence or enclosure set in a waterway for taking fish  2: 
   a dam in a stream to raise the water level or divert its flow