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1. (n.) hydroponics
(used with a sing. v.) the cultivation of plants by placing the roots in liquid nutrient solutions rather than in soil; soilless growth of plants.
Etymology: (1935–40; hydro -1+ (geo )ponics)
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| Definition of 'hydroponics' |
Princeton's WordNet |
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1. (noun) hydroponics, aquiculture, tank farming
a technique of growing plants (without soil) in water containing dissolved nutrients
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| Definition of 'hydroponics' |
U.S. National Library of Medicine |
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1. hydroponics
A technique for growing plants in culture solutions rather than in soil. The roots are immersed in an aerated solution containing the correct proportions of essential mineral salts. (From Concise Dictionary of Biology, 1990)
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Definitions of hydroponics 
