Dict: easton - Winnow

easton:

Winnow @ Corn was winnowed,

(1.) By being thrown up by a shovel against the wind. As a rule this was done in the evening or during the night, when the west wind from the sea was blowing, which was a moderate breeze and fitted for the purpose. The north wind was too strong, and the east wind came in gusts.

(2.) By the use of a fan or van, by which the chaff was blown away kjv@Ruth:3:2; kjv@Isaiah:30:24; kjv@Jeremiah:4:11-12; kjv@Matthew:3:12).