a person or thing that ejects.
(in a firearm or gun) the mechanism that after firing throws out the empty cartridge or shell.
Also called eductor. a device for inducing a flow of a fluid from a chamber or vessel by using the pressure of a jet of water, air, steam, etc., to create a partial vacuum in such a way as to entrain the fluid to be removed.
any of various devices for removing work from a machine or die.

1630–40; eject + -or2

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ejector (ɪˈdʒɛktə)
1.  a person or thing that ejects
2.  the mechanism in a firearm that ejects the empty cartridge or shell after firing

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Discard the tip by depressing the tip ejector button, as shown below.
There are currently no data on internal ejector flow to validate physical models needed to improve ejector design.
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