Early form of KERN, to form grains, to granulate.

1

1297.  R. Glouc. (1724), 490. Tho grene corn in somer ssolde curne.

2

1393.  Langl., P. Pl., C. XIII. 180. Shal neuer spir springen vp ne spik on strawe curne [v.r. kerne, kurne].

3