n. 沉淀, 沉积

[化] 沉积作用; 沉降

[医] 沉淀, 沉积, 沉降

[ noun ]
the phenomenon of sediment or gravel accumulating
<noun.phenomenon>

Sedimentation \Sed`i*men*ta"tion\, n.
The act of depositing a sediment; specifically (Geol.), the
deposition of the material of which sedimentary rocks are
formed.