Growing plants in air or fog without using aeroponics, soil or aggregate media. The word "aeroponic" is derived from the Greek meanings of aer (ἀήρ, "air") and ponos (πόνος, "labor"). Aeroponic culture differs from both traditional hydroponic, aquaponic, and in-vitro (plant tissue culture) growth. Unlike hydroponics, which uses liquid nutrient solution as the growth medium and minerals necessary to sustain plant growth, or aquaponics, which uses water and fish waste, it is made without aeroponic growing medium. It is sometimes considered a kind of hydroponics because water is also used in aeroponics to deliver nutrients.