Some manufacturers use an amalgamator to distribute these uniformly through the soap, which eliminates at least one milling.
He had heard the amalgamator, and whirled like lightning and dashed out of the mill and into the darkness.
1650s, back-formation from amalgamation, or from adjective amalgamate (1640s) from amalgam. Originally in metallurgy; figurative sense of "to unite" (races, etc.) is attested from 1802. Related: Amalgamated; amalgamating. Earlier verb was amalgamen (1540s).