1 [leech]
verb (used with object)
to dissolve out soluble constituents from (ashes, soil, etc.) by percolation.
to cause (water or other liquid) to percolate through something.
verb (used without object)
(of ashes, soil, etc.) to undergo the action of percolating water.
to percolate, as water.
the act or process of leaching.
a product or solution obtained by leaching; leachate.
the material leached.
a vessel for use in leaching.

1425–75; late Middle English leche leachate, infusion, probably Old English *læc(e), *lec(e), akin to leccan to wet, moisten, causative of leak

leachable, adjective
leachability, noun
leacher, noun
unleached, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
leach1 (liːtʃ)
1.  to remove or be removed from a substance by a percolating liquid
2.  to lose or cause to lose soluble substances by the action of a percolating liquid
3.  percolate another word for percolate
4.  the act or process of leaching
5.  a substance that is leached or the constituents removed by leaching
6.  a porous vessel for leaching
[C17: variant of obsolete letch to wet, perhaps from Old English leccan to water; related to leak]

leach2 (liːtʃ)
a variant spelling of leech

Leach (liːtʃ)
Bernard (Howell). 1887--1979, British potter, born in Hong Kong

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

O.E. leccan "to moisten" (see leak). The word disappears, then re-emerges late 18c. in a technological sense in ref. to percolating liquids.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

leaching leach·ing (lē'chĭng)
See lixiviation.

leach v.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
leaching   (lē'chĭng)  Pronunciation Key 
The removal of soluble material from a substance, such as soil or rock, through the percolation of water. Organic matter is typically removed from a soil horizon and soluble metals or salts from a rock by leaching. Leaching differs from eluviation in that it affects soluble, not suspended, material and often results in the complete removal of the material from the soil or rock.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Fertilizers have a horrible habit of leaching into waterways.
The horizons are caused by leaching of acids by the native trees and the high
  level of rainfall.
Where water is used to control fly ash, flooding and leaching can cause long
  term serious environmental damage.
These chemicals are used in many types of plastic food wrappings and may well
  be leaching into foods.
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