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 for Horse power
From The Collaborative International Dictionary of English v.0.48 :

  Horse power \Horse" pow`er\
     1. The power which a horse exerts.
        [1913 Webster]
     2. (Mach.) A unit of power, used in stating the power
        required to drive machinery, and in estimating the
        capabilities of animals or steam engines and other prime
        movers for doing work. It is the power required for the
        performance of work at the rate of 33,000 English units of
        work per minute; hence, it is the power that must be
        exerted in lifting 33,000 pounds at the rate of one foot
        per minute, or 550 pounds at the rate of one foot per
        second, or 55 pounds at the rate of ten feet per second,
        [1913 Webster]
     Note: The power of a draught horse, of average strength,
           working eight hours per day, is about four fifths of a
           standard horse power.
           [1913 Webster]
     Brake horse power, the net effective power of a prime
        mover, as a steam engine, water wheel, etc., in horse
        powers, as shown by a friction brake. See Friction
        brake, under Friction.
     Indicated horse power, the power exerted in the cylinder of
        an engine, stated in horse powers, estimated from the
        diameter and speed of the piston, and the mean effective
        pressure upon it as shown by an indicator. See
     Nominal horse power (Steam Engine), a term still sometimes
        used in England to express certain proportions of
        cylinder, but having no value as a standard of
        [1913 Webster]
     3. A machine worked by a horse, for driving other machinery;
        a horse motor.
        [1913 Webster]

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