Burrstone

//ˈbɚstoʊn// noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    A tough, silicified limestone formerly used to make millstones, typified by the presence of multiple cavities that originally housed fossilized shells. countable, uncountable

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.