The Collaborative International Dictionary of English v.0.48:

Quern \Quern\, n. [AS. cweorn, cwyrn; akin to D. kweern, OHG.
   quirn, Icel. kvern, Sw. qvarn, Dan. qu[ae]rn, Goth. qairnus
   (in asiluqa['i]rnus), Lith. q[`i]rnos, and perh. E. corn.]
   A mill for grinding grain, the upper stone of which was
   turned by hand; -- used before the invention of windmills and
   watermills. --Shak.
   [1913 Webster]

         They made him at the querne grind.       --Chaucer.
   [1913 Webster]

WordNet (r) 3.0 (2006):

quern
    n 1: a primitive stone mill for grinding corn by hand