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reaction
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- Reaction - n. - Any action in resisting other action or force; counter tendency; movement in a contrary direction; reverse action.
- Reaction - n. - The mutual or reciprocal action of chemical agents upon each other, or the action upon such chemical agents of some form of energy, as heat, light, or electricity, resulting in a chemical change in one or more of these agents, with the production of new compounds or the manifestation of distinctive characters. See Blowpipe reaction, Flame reaction, under Blowpipe, and Flame.
- Reaction - n. - An action induced by vital resistance to some other action; depression or exhaustion of vital force consequent on overexertion or overstimulation; heightened activity and overaction succeeding depression or shock.
- Reaction - n. - The force which a body subjected to the action of a force from another body exerts upon the latter body in the opposite direction.
- Reaction - n. - Backward tendency or movement after revolution, reform, or great progress in any direction.
- Reactionaries - pl. - of Reactionary
- Reactionary - a. - Being, causing, or favoring reaction; as, reactionary movements.
- Reactionary - n. - One who favors reaction, or seeks to undo political progress or revolution.
- Reactionist - n. - A reactionary.
- Xanthoproteic - a. - Pertaining to, or derived from, xanthoprotein; showing the characters of xanthoprotein; as, xanthoproteic acid; the xanthoproteic reaction for albumin.
- Antiperistasis - n. - Opposition by which the quality opposed asquires strength; resistance or reaction roused by opposition or by the action of an opposite principle or quality.
- Barker's mill - - A machine, invented in the 17th century, worked by a form of reaction wheel. The water flows into a vertical tube and gushes from apertures in hollow horizontal arms, causing the machine to revolve on its axis.
- Recoil - n. - Specifically, the reaction or rebounding of a firearm when discharged.
- Turbine - n. - A water wheel, commonly horizontal, variously constructed, but usually having a series of curved floats or buckets, against which the water acts by its impulse or reaction in flowing either outward from a central chamber, inward from an external casing, or from above downward, etc.; -- also called turbine wheel.
- Passive - a. - Designating certain morbid conditions, as hemorrhage or dropsy, characterized by relaxation of the vessels and tissues, with deficient vitality and lack of reaction in the affected tissues.
- Water wheel - - Any wheel for propelling machinery or for other purposes, that is made to rotate by the direct action of water; -- called an overshot wheel when the water is applied at the top, an undershot wheel when at the bottom, a breast wheel when at an intermediate point; other forms are called reaction wheel, vortex wheel, turbine wheel, etc.
- Catalysis - n. - A process by which reaction occurs in the presence of certain agents which were formerly believed to exert an influence by mere contact. It is now believed that such reactions are attended with the formation of an intermediate compound or compounds, so that by alternate composition and decomposition the agent is apparenty left unchanged; as, the catalysis of making ether from alcohol by means of sulphuric acid; or catalysis in the action of soluble ferments (as diastase, or ptyalin) on starch.
- Test - n. - A reaction employed to recognize or distinguish any particular substance or constituent of a compound, as the production of some characteristic precipitate; also, the reagent employed to produce such reaction; thus, the ordinary test for sulphuric acid is the production of a white insoluble precipitate of barium sulphate by means of some soluble barium salt.
- Electro-muscular - a. - Pertaining the reaction (contraction) of the muscles under electricity, or their sensibility to it.
- Wheel - n. - A firework which, while burning, is caused to revolve on an axis by the reaction of the escaping gases.
- Abutment - n. - A fixed point or surface from which resistance or reaction is obtained, as the cylinder head of a steam engine, the fulcrum of a lever, etc.