elutriate
Concise Oxford English Dictionary © 2008 Oxford University Press:
elutriate /ɪˈl(j)uːtrɪeɪt/
▶verb Chemistry separate (particles in a mixture) by suspension in an upward flow of liquid or gas.
– derivatives
elutriation noun.
elutriation noun.
– origin C18: from L. elutriat-, elutriare ‘wash out’.
'elutriate' also found in these Oxford entries:

