
1) Cooking technique 2) Engineering vehicle 3) Scooping up a river bottom 4) Using a dragnet
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https://www.crosswordclues.com/clue/dredging

Dredging is an excavation activity or operation usually carried out at least partly underwater, in shallow seas or fresh water areas with the purpose of gathering up bottom sediments and disposing of them at a different location. This technique is often used to keep waterways navigable. It is also used as a way to replenish sand on some public bea...
Found on
http://en.wikipedia.org/wiki/Dredging
[cooking] This article is about the cooking technique. For other uses, see Dredge (disambiguation). Dredging is a cooking technique used to coat wet or moist foods with a dry ingredient prior to cooking. Put most simply, dredging involves little more than pulling/rolling the wet food through the dry material to provide an even coating. The ...
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http://en.wikipedia.org/wiki/Dredging_(cooking)

(water management) the repositioning of soil from an aquatic environment, using specialized equipment, in order to initiate infrastructural and/or ecological improvements.
Found on
http://en.wikipedia.org/wiki/Glossary_of_environmental_science

dredge designed to catch scallops, oysters or sea cucumbers are towed along the bottom of the sea by specially designed dredge boats.
Found on
http://en.wikipedia.org/wiki/Glossary_of_fishery_terms

• (p. pr. & vb. n.) of Dredge
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http://thinkexist.com/dictionary/meaning/dredging/

(from the article `mining`) Dredging is the underwater excavation of a placer deposit by floating equipment. Dredging systems are classified as mechanical or hydraulic, ...
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http://www.britannica.com/eb/a-z/d/74

a method used for harvesting bivalve molluscs such as oysters, clams and scallops from the seabed.
Found on
http://www.encyclo.co.uk/local/20740

To cover generously with sifted flour or sugar.
Found on
http://www.encyclo.co.uk/local/21220

Digging up and removing material from wetlands or waterways, usually to make them deeper or wider.
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http://www.encyclo.co.uk/local/21804

A means of extracting gold bearing materials or any other material from under water.
Found on
http://www.juniorminers.com/glossary.html

Dredging is a term applied to the operation of removing mud, silt, and other deposits from the bottom of harbours, canals, rivers, docks, etc. The most simple dredging apparatus is the spoon apparatus, which consists of a strong iron ring or hoop, properly formed for making an impression upon the soft matter at the bottom, so as to scoop it into a ...
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http://www.probertencyclopaedia.com/browse/AD.HTM

dredge designed to catch scallops, oysters or sea cucumbers are towed along the bottom of the sea by specially designed dredge boats.
Found on
http://www.translationdirectory.com/glossaries/glossary245.php

(water management) the repositioning of soil from an aquatic environment, using specialized equipment, in order to initiate infrastructural and/or ecological improvements.
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http://www.translationdirectory.com/glossaries/glossary306.php

Removal of mud from the bottom of water bodies. This can disturb the ecosystem and causes silting that kills aquatic life. Dredging of contaminated muds can expose biota to heavy metals and other toxics. Dredging activities may be subject to regulation under Section 404 of the Clean Water Act.
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https://www.encyclo.co.uk/local/20094

(SMP) Excavation or displacement of the bottom or SHORELINE of a water body. Dredging can be accomplished with mechanical or hydraulic machines. Most is done to maintain channel depths or berths for navigational purposes; other dredging is for shellfish harvesting or for cleanup of polluted sediments.
Found on
https://www.encyclo.co.uk/local/20127

Underwater excavation activity or operation with the purpose of gathering up bottom sediments and disposing them at a different location. Sediment that has been dredged from the waterway is called dredged material or dredge spoil.
Found on
https://www.encyclo.co.uk/local/22831

A fishing method used along the seabed for catching bivalve molluscs such as oysters, clams and scallops.
Found on
https://www.sustainweb.org/goodcatch/glossary_of_seafood_terms/
No exact match found.