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accretion (noun) a gradual growth or increase over a period, as for example, the forming of new layers on some thing as time passes.
In deserts, as the wind drives sand over an area, a new layer forms on the old layer. This is accretion. There can be accretion of fat in the human body.
- The doctor has warned her against eating high calorie food, as it might lead to accretion of fat, resulting in her gaining weight.
- Sand dunes are formed in deserts by the accretion of sand because of the action of the wind.