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sediment

sed·i·ment [ séddimənt ] (plural sed·i·ments)


noun 
Definition:
 
1. settled matter at bottom of liquid: material, originally suspended in a liquid, that settles at the bottom of the liquid when it is left standing for a long time

2. eroded material: material eroded from preexisting rocks that is transported by water, wind, or ice and deposited elsewhere

[Mid-16th century. < Latin sedimentum "settling" < sedere "sit"]
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