springing line of an arch

1 definition found

springing line of an arch - Collaborative International Dictionary of English v.0.48 :

  Springing \Spring"ing\, n.
     1. The act or process of one who, or that which, springs.
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     2. Growth; increase; also, that which springs up; a shoot; a
        plant.
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              Thou blessest the springing thereof.  --Ps. lxv. 10.
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     Springing line of an arch (Arch.), the horizontal line
        drawn through the junction of the vertical face of the
        impost with the curve of the intrados; -- called also
        spring of an arch.
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