The DICT Development Group

Search for:
Search type:

Database copyright information
Server information

2 definitions found
 for Reaction wheel
From The Collaborative International Dictionary of English v.0.48 :

  Reaction \Re*ac"tion\ (r[-e]*[a^]k"sh[u^]n), n. [Cf. F.
     1. Any action in resisting other action or force; counter
        tendency; movement in a contrary direction; reverse
        [1913 Webster]
     2. (Chem.) 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
        [1913 Webster]
     3. (Med.) 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.
        [1913 Webster]
     4. (Mech.) The force which a body subjected to the action of
        a force from another body exerts upon the latter body in
        the opposite direction.
        [1913 Webster]
              Reaction is always equal and opposite to action,
              that is to say, the actions of two bodies upon each
              other are always equal and in opposite directions.
                                                    --Sir I.
                                                    Newton (3d Law
                                                    of Motion).
        [1913 Webster]
     5. (Politics) Backward tendency or movement after revolution,
        reform, or great progress in any direction.
        [1913 Webster]
              The new king had, at the very moment at which his
              fame and fortune reached the highest point,
              predicted the coming reaction.        --Macaulay.
        [1913 Webster]
     6. (Psycophysics) A regular or characteristic response to a
        stimulation of the nerves.
        [Webster 1913 Suppl.]
     7. An action by a person or people in response to an event.
        The reaction may be primarily mental (" a reaction of
        surprise") but is usually manifested by some activity.
     Reaction time (Physiol.), in nerve physiology, the interval
        between the application of a stimulus to an end organ of
        sense and the reaction or resulting movement; -- called
        also physiological time.
     Reaction wheel (Mech.), a water wheel driven by the
        reaction of water, usually one in which the water,
        entering it centrally, escapes at its periphery in a
        direction opposed to that of its motion by orifices at
        right angles, or inclined, to its radii.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Water wheel \Wa"ter wheel`\
     1. 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.
        [1913 Webster]
     2. The paddle wheel of a steam vessel.
        [1913 Webster]
     3. A wheel for raising water; a noria, or the like.
        [1913 Webster]

Contact=webmaster@dict.org Specification=RFC 2229