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lewis
Lewis acid
Lewis base
Lewis gun
Lewis structure
Lewis with Harris
lewisite
lewisson
Lewiston
lex
lex talionis
lexeme
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ley farming
ley farm·ing


noun 
Definition:
 
U.K. crop rotation: the practice of growing grass in fields normally planted with grain or other tilled crops in order to prevent the soil from becoming exhausted
[< assumed Old English lǣge "fallow," related to lie1]
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