millstones is a form of:

Millstone



noun
1.
(each of two circular stones for grinding corn, heavy burden or, responsibility) ត្បាល់កិន (ថ្ម)
2.
(បច្ចេកទេស) បន្ទុក​អំរែកធ្ងន់ធ្ងរ
ENGLISH MEANING
noun
1.
One of two circular stones used for grinding grain or other substance.