What about this word?
Maybe it comes from מָצָא, to find?
Or it rather comes from verb יָצָא, go out?
Pattern PIS-d535 is the answer: it is the Hiph'il Participle, singular feminine absolute, of verb יָצָא, go out.
So, (female) who/which causes to go out, who/which expels. Or, what is the same, (female) excluding.