Winnow

Webster's Practical Dictionary- A Practical Dictionary of the Englih Language · 1884 · p. 523

win'no, v. t. [-.nowed (-nod), -sowisg.] To separate and drive off the chaff from by means of wind; to sift for the purpose of separating falsehood from truth; to fan, beat, as with wings, —v. i. To separate chaff from grain.