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 for galvanic couple
From The Collaborative International Dictionary of English v.0.48 :

  Couple \Cou"ple\ (k[u^]p"'l), n. [F. couple, fr. L. copula a
     bond, band; co- + apere, aptum, to join. See Art, a., and
     cf. Copula.]
     1. That which joins or links two things together; a bond or
        tie; a coupler. [Obs.]
        [1913 Webster]
              It is in some sort with friends as it is with dogs
              in couples; they should be of the same size and
              humor.                                --L'Estrange.
        [1913 Webster]
              I'll go in couples with her.          --Shak.
        [1913 Webster]
     2. Two of the same kind connected or considered together; a
        pair; a brace. "A couple of shepherds." --Sir P. Sidney.
        "A couple of drops" --Addison. "A couple of miles."
        --Dickens. "A couple of weeks." --Carlyle.
        [1913 Webster]
              Adding one to one we have the complex idea of a
              couple.                               --Locke.
        [1913 Webster]
              [Ziba] met him with a couple of asses saddled. --2
                                                    Sam. xvi. 1.
        [1913 Webster]
     3. A male and female associated together; esp., a man and
        woman who are married or betrothed.
        [1913 Webster]
              Such were our couple, man and wife.   --Lloyd.
        [1913 Webster]
              Fair couple linked in happy, nuptial league.
        [1913 Webster]
     4. (Arch.) See Couple-close.
        [1913 Webster]
     5. (Elec.) One of the pairs of plates of two metals which
        compose a voltaic battery; -- called a voltaic couple or
        galvanic couple.
        [1913 Webster]
     6. (Mech.) Two rotations, movements, etc., which are equal in
        amount but opposite in direction, and acting along
        parallel lines or around parallel axes.
        [1913 Webster]
     Note: The effect of a couple of forces is to produce a
           rotation. A couple of rotations is equivalent to a
           motion of translation.
           [1913 Webster]

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