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accelerator a mechanical device that regulates the speed of something, esp. the gas pedal of a car. [1/3 definitions]
acetylene a highly flammable colorless gas used esp. to cut and weld metal and to give light.
adsorb to gather (a gas or liquid) to a surface. (Cf. absorb.)
adsorption the condensation or adhesion of a gas, vapor, liquid, or dissolved substance on the surface of a solid or liquid. (Cf. absorption.)
aerate to fill or charge (a liquid) with a gas, esp. carbon dioxide. [1/3 definitions]
aero- gas. [1/3 definitions]
aerosol a suspension of liquid or solid particles in a gas. [1/2 definitions]
aerostat an aircraft, such as a balloon or dirigible, that is lifted and held aloft by a gas that is lighter than air.
afterdamp a suffocating gas or mixture of gases that remains in a mine after a methane explosion or fire.
air hole an opening for the intake or discharge of air or gas. [1/3 definitions]
ammonia the pungent gas formed from the chemical combination of nitrogen and hydrogen, used esp. in refrigeration and in making fertilizers. [2 definitions]
anesthetist a person, usu. a doctor or nurse, trained to administer gas or drugs that cause lack of sensation or loss of consciousness.
arc lamp a lamp, such as a searchlight, in which light is produced by an electric arc passing through a gas between two hot electrodes; arc light.
Argand burner an oil or gas burner having a metal tube inside a cylindrical wick, through which air is conducted directly to the flame.
argon a chemical element of the inert gas group that has eighteen protons in each nucleus. (symbol: Ar)
aspirator a device that removes gas or fluids by suction, esp. one used to evacuate a body cavity.
balloon a large bag made of thin material designed to inflate and be lifted off the ground when filled with hot air or a gas that is lighter than air. [1/8 definitions]
bead a small, spherical object or quantity, such as a drop of liquid or a gas bubble. [1/8 definitions]
belch to expel gas from the stomach through the mouth, in a spasmodic, noisy burst, as after eating or drinking. [1/4 definitions]
blackdamp a suffocating gas composed of carbon dioxide and nitrogen, found as a residue of fires and explosions of combustible gases in mines; chokedamp.
bladder an expandable sac or pouch in humans and animals in which gas or liquid, esp. urine, collects. [1/3 definitions]