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aquiculture the growing of plants, often for their edible fruits, in nutrient water or water-soaked inert material rather than in soil; hydroponics. [1/2 definitions]
argon a chemical element of the inert gas group that has eighteen protons in each nucleus. (symbol: Ar)
cellulose an inert carbohydrate that is the main element of plant tissue, used in manufacturing paper, cellophane, textiles, and the like.
dead weight the unrelieved weight of any inert mass, esp. a human or animal body. [1/3 definitions]
helium a chemical element of the inert gas group that contains two protons in each nucleus and that occurs as a lighter-than-air gas often used for lifting power and in air-free atmospheres where an inert gas is required, as in welding. (symbol: He)
inactive not moving or operating; inert; quiescent. [1/3 definitions]
inertia the condition of being inert; motionlessness; inactivity. [1/2 definitions]
krypton an inert gaseous chemical element that has thirty-six protons in each nucleus, used esp. as the atmosphere in high-powered light bulbs. (symbol: Kr)
neon a chemical element of the inert gas group that has ten protons in each nucleus and that is used in liquid form as a refrigerant, and in gaseous form as an atmosphere for electrical discharge lamps because it glows a brilliant orange when excited by electricity. (symbol: Ne) [1/5 definitions]
-on2 used in naming inert gases.
passive in chemistry, exhibiting no reaction; inert. [1/6 definitions]
placebo an inert substance given to a patient as if it were a drug in order to placate or to serve as a control in an experiment. [1/2 definitions]
radon a radioactive chemical element of the inert gas group that has eighty-six protons in each nucleus and that is produced by the radioactive decay of trace amounts of radium in the soil. (symbol: Rn)
spark chamber any of several devices using a great number of parallel, oppositely charged metal plates in an inert gas to detect subatomic particles, rays, or the like, which make trails of sparks between the plates.
xenon a chemical element of the inert gas group that has fifty-four protons in each nucleus and that is used as the atmosphere in fluorescent lamps because it glows with a blue light when excited by electricity. (symbol: Xe)