a voussoir appearing on a face of an arch.
tonsil stonesRead more in this article about some frequently asked questions and fun facts related to our definitions.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for ring stone
As they stopped at the ring-stone, between the byre and the cottage, he went up to the shepherd.Pharais and The Mountain Lovers|Fiona Macleod