a horizontal line between the springs of an arch or dome.
the rise or the angle of the rise of an arch.
What Exactly Is The Spring Equinox?We get pretty excited about the spring equinox bringing us out of winter and officially starting the season of spring. But what exactly is the spring equinox? And does an equinox happen at the start of every season? First, let’s get into the equinox, which actually occurs just twice a year. The word equinox comes from Latin and means “equality of night and day.” So, the …
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
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