"Chaff (/tʃæf/; also UK: /tʃɑːf/) is the dry, scaly protective casings of the seeds of cereal grain, or similar fine, dry, scaly plant material such as ...
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scaly parts of flowers, or finely chopped straw. Chaff is indigestible by humans, but livestock can eat it and in agriculture it is used as livestock fodder, or is a waste material ploughed into the soil or burned." - (en.wikipedia.org 18.12.2019)