'breakstone' definitions:

Definition of 'breakstone'

(from WordNet)
noun
Any of various plants of the genus Saxifraga [syn: saxifrage, breakstone, rockfoil]

Definition of 'breakstone'

From: GCIDE
  • breakstone \break"stone`\ n.
  • 1. Any of various plants of the genus Saxifraga.
  • Syn: saxifrage, rockfoil. [WordNet 1.5]