: one that expels someone or something
They point to the abject failure to reform immigration policy and say that … America has become what it never has been—an expeller of huddled masses.—
Gregg Krupa, Detroit News, 4 Dec. 2008
especially
: a screw press for expressing vegetable oil from soybeans or other seeds
In industrial practice, after the oil is removed using mechanical means by an expeller, you have a mash that's left over. —Jimmy Lovaas, Seattle Times, 10 June 2013
—often used in combination
expeller-pressed canola oil
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Merriam-Webster unabridged
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