Sediment \Sed"i*ment\, n. [F. s['e]diment, L. sedimentum a settling, fr. sedere to sit, to settle. See Sit.]

1. The matter which subsides to the bottom, frrom water or any other liquid; settlings; lees; dregs.

2. (Geol.) The material of which sedimentary rocks are formed.

Source: Webster's Revised Unabridged Dictionary (1913)