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weir

[weer] /wɪər/
noun
1.
a small dam in a river or stream.
2.
a fence, as of brush or narrow boards, or a net set in a stream, channel, etc., for catching fish.
Origin
900
before 900; Middle English were, Old English wer, derivative of root of werian to defend, dam up
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for weir
  • To blame the weir for environmental destruction which has already occurred is political humbug.
  • Spawning fish were transferred upstream of the weir, while sea lampreys were destroyed.
  • Enhanced oil spill recovery rate using the weir skimmer.
  • weir sticks are commercially calibrated stick or staff gage type devices which may be placed by hand upon the crest of a weir.
  • weir spacing is dependent on the streamflow leaving the weir and its intersection with the downstream structure or bank.
  • The weir is some way upstream of the lock, at the northern end of ray mill island.
British Dictionary definitions for weir

weir

/wɪə/
noun
1.
a low dam that is built across a river to raise the water level, divert the water, or control its flow
2.
a series of traps or enclosures placed in a stream to catch fish
Word Origin
Old English wer; related to Old Norse ver, Old Frisian were, German Wehr

Weir

/wɪə/
noun
1.
Judith. born 1954, Scottish composer: her operas include A Night at the Chinese Opera (1987), and Armida (2005)
2.
Peter. born 1944, Australian film director; his films include Dead Poets Society (1989), The Truman Show (1998), and Master and Commander (2003)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for weir
n.

Old English wer "dam, fence, enclosure," especially one for catching fish (related to werian "dam up"), from Proto-Germanic *warjanan (cf. Old Norse ver, Old Frisian and Middle Dutch were, Dutch weer, Old High German wari, German Wehr "defense, protection," Gothic warjan "to defend, protect"), from PIE *wer- "to cover, shut" (cf. Sanskrit vatah "enclosure," vrnoti "covers, wraps, shuts;" Lithuanian uzveriu "to shut, to close;" Old Persian *pari-varaka "protective;" Latin (op)erire "to cover;" Old Church Slavonic vora "sealed, closed," vreti "shut;" Old Irish feronn "field," properly "enclosed land").

Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Article for weir

any control or barrier placed in an open channel to permit measurement of water discharge. The latter may be computed from a formula expressing the discharge in terms of crest length of the weir, depth of flow above the weir, weir geometry, and other factors. A variety of weirs have been used in streams, the so-called sharp-crested and trapezoidal forms being relatively common; but broad-crested, triangular, and contracted weirs are also favoured in certain circumstances. Spillways, controls, and embankments designed to permit discharge measurements are simply different kinds of broad-crested weirs

Learn more about weir with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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