sediment : Idioms & Phrases
alluvial sediment
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noun clay or silt or gravel carried by rushing streams and deposited where the stream slows down
alluvium; alluvion; alluvial deposit.
WordNet
Lateritious sediment
(Med.) , a sediment in urine resembling brick dust, observed after the crises of fevers, and at the termination of gouty paroxysms. It usually consists of uric acid or urates with some coloring matter.