elutriate

American Heritage® Dictionary of the English Language, Fourth Edition

1. v. To purify, separate, or remove (ore, for example) by washing, decanting, and settling.
2. v. To wash away the lighter or finer particles of (soil, for example).

Century Dictionary and Cyclopedia

1. To purify by washing and straining or decanting; purify in general.

Wiktionary

1. v. to decant; to purify something by straining it
2. v. to separate large and small particles through an upwardly flowing current of liquid or gas

GNU Webster's 1913

1. v. To wash or strain out so as to purify; ; to strain off or decant, as a powder which is separated from heavier particles by being drawn off with water; to cleanse, as by washing.