Millstone

(n.) One of two circular stones used for grinding grain or other substance.

Thesaurus Entries

bale, burden, burdening, burthen, cargo, charge, charging, cheese grater, comminutor, crusher, cumber, cumbrance, deadweight, drag, duty, encumbrance, freight, granulator, grater, grinder, handicap, incubus, incumbency, kominuter, lading, levigator, load, loading, masher, mill, mortar and pestle, nutmeg grater, onus, oppression, overload, overtaxing, overweighting, pestle, pressure, pulverizer, quern, quernstone, rock crusher, roller, saddling, shredder, steamroller, superincumbency, surcharge, task, tax, taxing, triturator, weight