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chaff (noun) husk; useless matter.
The worthless outer covering of grains like wheat and paddy, separated from the seed, before it is cooked or eaten, is chaff. The useless material thrown away, for example, straw or hay, after threshing or winnowing grain, is also chaff. Anything useless or worthless is chaff. The book is just so many pages of chaff. This means that the book has nothing useful or interesting to offer. It is dull or useless.
- After the seeds were gathered, the chaff lying in heaps suddenly caught fire and could be put out with great difficulty.
- The chaff separated from the grain, because of the steady heat it gives out, is used as fuel, or as a source of fuel.
- Discerning listeners found a lot of chaff in his hour-long lecture. It was clear that he did not have many points of interest or of value to share with his audience.