- a horizontal line between the springs of an arch or dome.
- the rise or the angle of the rise of an arch.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for springing line
Their arches are richly moulded and acutely pointed, the springing-line being rather low down.Bell's Cathedrals: The Cathedral Church of Ripon
Cecil Walter Charles Hallett