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2 definitions found
 for Back pressure
From The Collaborative International Dictionary of English v.0.48 :

  Pressure \Pres"sure\ (?; 138), n. [OF., fr. L. pressura, fr.
     premere. See 4th Press.]
     1. The act of pressing, or the condition of being pressed;
        compression; a squeezing; a crushing; as, a pressure of
        the hand.
        [1913 Webster]
     2. A contrasting force or impulse of any kind; as, the
        pressure of poverty; the pressure of taxes; the pressure
        of motives on the mind; the pressure of civilization.
        [1913 Webster]
              Where the pressure of danger was not felt.
        [1913 Webster]
     3. Affliction; distress; grievance.
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              My people's pressures are grievous.   --Eikon
        [1913 Webster]
              In the midst of his great troubles and pressures.
        [1913 Webster]
     4. Urgency; as, the pressure of business.
        [1913 Webster]
     5. Impression; stamp; character impressed.
        [1913 Webster]
              All saws of books, all forms, all pressures past.
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     6. (Mech.) The action of a force against some obstacle or
        opposing force; a force in the nature of a thrust,
        distributed over a surface, often estimated with reference
        to the amount upon a unit's area.
        [1913 Webster]
     7. Electro-motive force.
        [Webster 1913 Suppl.]
     Atmospheric pressure, Center of pressure, etc. See under
        Atmospheric, Center, etc.
     Back pressure (Steam engine), pressure which resists the
        motion of the piston, as the pressure of exhaust steam
        which does not find free outlet.
     Fluid pressure, pressure like that exerted by a fluid. It
        is a thrust which is normal and equally intense in all
        directions around a point. --Rankine.
     Pressure gauge, a gauge for indicating fluid pressure; a
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Back \Back\, a.
     1. Being at the back or in the rear; distant; remote; as, the
        back door; back settlements.
        [1913 Webster]
     2. Being in arrear; overdue; as, back rent.
        [1913 Webster]
     3. Moving or operating backward; as, back action.
        [1913 Webster]
     Back blocks, Australian pastoral country which is remote
        from the seacoast or from a river. [Webster 1913 Suppl.]
     Back charges, charges brought forward after an account has
        been made up.
     Back filling (Arch.), the mass of materials used in filling
        up the space between two walls, or between the inner and
        outer faces of a wall, or upon the haunches of an arch or
     Back pressure. (Steam Engine) See under Pressure.
     Back rest, a guide attached to the slide rest of a lathe,
        and placed in contact with the work, to steady it in
     Back slang, a kind of slang in which every word is written
        or pronounced backwards; as, nam for man.
     Back stairs, stairs in the back part of a house; private
        stairs. Also used adjectively. See Back stairs,
        Backstairs, and Backstair, in the Vocabulary.
     Back step (Mil.), the retrograde movement of a man or body
        of men, without changing front.
     Back stream, a current running against the main current of
        a stream; an eddy.
     To take the back track, to retrace one's steps; to retreat.
        [1913 Webster]

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