Source : Webster's Revised Unabridged Dictionary (1913)

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 : WordNet®

sediment
     n : matter deposited by some natural process [syn: {deposit}]
     v 1: deposit as a sediment
     2: settle as sediment