Wiktionary
winnowing machine
n. A machine which winnows grain
Usage examples of "winnowing machine".
In the north of Italy, the fresh seeds are alone used, and after they have been crushed and the seed coats very carefully removed with a winnowing machine and by hand, the blanched seeds are put into small hempen bags, which are arranged in superposed layers in a powerful hydraulic press, with a sheet of iron heated to 90 degrees F.