Definition of poundstone in US English:

poundstone

noun

  • A natural stone used as a weight, especially in measuring quantities of butter; especially a fossil echinoid of a particular kind (so used because they consistently had a weight of approximately one pound). Now historical.

Origin

Late 16th century; earliest use found in Timothy Kendall (fl. 1572–1577), translator and poet. From pound + stone.

Pronunciation

poundstone

/ˈpaʊn(d)stəʊn/