springer

A springer spaniel.

A cow about to give birth.

The bottom stone of an arch resting on the impost.

The point or place where the curve of an arch or vault begins.

In old music, a grace or embellishment, consisting of an after-note one degree above the principal note: as

One who or that which springs, in any sense.

A youth; a lad.

In architecture:

The impost or place where the vertical support to an arch terminates, and the curve of the arch begins.