Chaff
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Chaff is the seed casings and other parts inedible to humans of plant matter harvested with cereal grains such as wheat. The chaff must be separated from the grain before use, by such techniques as threshing and wind winnowing. The word "Chaff" is also used to refer to something worthless, such as in the expression "separating the wheat from the chaff", meaning to find things of value and separate them from things of no value.
A horse and cattle feed
If hay, or less often straw, is cut into very short lengths by a specially designed machine (called a chaff cutter), and fed to horses or cattle it is called chaff. It can be fed to horses which have problems with their wind (breathing) to reduce the amount of dust they breath in while eating hay.
Radar countermeasure
Chaff (radar countermeasure) is a technique in which aircraft or other targets spread a cloud of small, thin bits of aluminum or plastic, which appears as a cluster of secondary targets on radar screens.
Referred to in Psalm 1
1Blessed is the man who does not walk in the counsel of the wicked or stand in the way of sinners or sit in the seat of mockers. 2 But his delight is in the law of the Lord, and on his law he meditates day and night. 3 He is like a tree planted by streams of water, which yields fruit in season and whose leaf does not wither. Whatever he does prospers. 4 Not so the wicked! They are like chaff that the wind blows away. 5 Therefore the wicked will not stand in the judgement, nor sinners in the assembly of the righteous. 6For the Lord watches over the way of the righteous, but the way of the wicked perish.