/ ˈsedɪmənt; NAmE / noun [ U ]
1.
the solid material that settles at the bottom of a liquid
2.
( geology ) sand, stones, mud, etc. carried by water or wind and left, for example, on the bottom of a lake, river, etc.
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WORD ORIGIN
mid 16th cent.: from French sédiment or Latin sedimentum settling, from sedere sit.