aeroponics
noun, plural in form but singular in construction
aero·pon·ics ¦er-ō-¦pä-niks 
: the growing of plants by suspending their roots in the air and spraying them with nutrient solutions
Hydroponics allows us to grow plants in a water-and-nutrient solution, while aeroponics grows them in a nutrient-laden mist.
Dickson D. Despommier, New York Times, 24 Apr. 2009
Dickson D. Despommier, New York Times, 24 Apr. 2009 aeroponic
¦er-ō-¦pä-nik
adjective Tomatoes take especially well to aeroponic growing. Johnathan L. Wright, Reno Gazette-Journal, 20 Aug. 2008
Johnathan L. Wright, Reno Gazette-Journal, 20 Aug. 2008 aeroponic technology
aeroponically
¦er-ō-¦pä-ni-k(ə-)lē
adverb Fog can actually carry dissolved nutrients for growing plants aeroponically, suspended in the air, with their clean roots dangling in the fog. Marshall Ingwerson, Christian Science Monitor, 1 Mar. 1985
Marshall Ingwerson, Christian Science Monitor, 1 Mar. 1985 
Word History
Etymology
aero- + (hydro)ponics
First Known Use
1957, in the meaning defined above