Definition of hydroponics noun from the Oxford Advanced Learner's Dictionary

 

hydroponics

 noun
noun
BrE BrE//ˌhaɪdrəˈpɒnɪks//
 
; NAmE NAmE//ˌhaɪdrəˈpɑːnɪks//
 
[uncountable]
 
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the process of growing plants in water or sand, rather than in soil Word Origin 1930s: from hydro- ‘of water’ + Greek ponos ‘labour’ + -ics.
See the Oxford Advanced American Dictionary entry: hydroponics