springing

Either of the points at which an arch begins to rise from its supports.

Liable to arise; contingent: as, springing uses. See use.

The act or process of leaping, arising, issuing, or proceeding; also, growth; increase.

In architecture, the point, from which an arch springs or rises; also, a springer.

The act or process of furnishing with springs; also, springs (as of a vehicle) collectively. See spring, n., 9.

The act or process of one who, or that which, springs.

Growth; increase; also, that which springs up; a shoot; a plant.

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.

Present participle of spring.

The action of the verb to spring.