"one who tends or takes care of anything," mid-15c., agent noun from mind (v.). Also from 15c. in now-obsolete sense of "one who has a good memory."
I turned around and there, a few hundred feet away, was our government minder, Li Wong Su, huffing and puffing toward us
mincemeat
mincing
mind
mind-boggling
-minded
minder
mindful
mindfulness
mindless
mind-reader
mindset