sed·i·ment /ˈsɛdəmənt/ 名詞
1. The matter which subsides to the bottom, from water or any other liquid; settlings; lees; dregs.
2. Geol. The material of which sedimentary rocks are formed.
n : matter deposited by some natural process [syn: deposit]
v 1: deposit as a sediment
2: settle as sediment