Chaff has multiple meanings depending on the context. Here are the different meanings of chaff:
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Agriculture: Chaff is the dry, scaly protective casing of the seeds of cereal grains or similar fine, dry, scaly plant material. It is indigestible by humans, but some livestock can eat it. In agriculture, it is used as livestock fodder, or is a waste material ploughed into the soil or burned.
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Military: Chaff is a radar countermeasure in which aircraft or other targets spread a cloud of small, thin pieces of aluminum, metallized glass fiber, or plastic, which either appears as a cluster of primary targets on radar screens or swamps the screen with multiple returns, in order to confuse and distract. Modern armed forces use chaff to distract radar-guided missiles from their targets. Most military aircraft and warships have chaff dispensing systems for self-defense).
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General: Chaff can also refer to something comparatively worthless or objects and ideas of little or no value. In the Bible, chaff refers to the loose, outer covering on wheat and other grains that must be separated in the threshing and winnowing process of harvesting grain.
