Quern

Quern
n. a stone hand mill for grinding corn [Old English cweorn; related to Old Frisian quern, Old High German kurn, Old Norse kverna, Gothic quairnus millstone]

(from http://www.regia.org/acmylen.htm)

and another, from Needham's Science and Civilization in China:
a Han pottery model of a winnowing fan and quern