noun Any device for separating sediments from liquids, such as a centrifuge.
noun An organism that feeds on bacteria or small algae that are found in sediments.
noun ↑ James A. H. Murray et al., editors (1884–1928), “Sedimentator”, in A New English Dictionary on Historical Principles (Oxford English Dictionary), volume VIII, Part 2 (S–Sh), London: Clarendon Press, →OCLC, page 374, column 2.