"Mongoloid" is a term used by one Dr. Down to describe people with
trisomy 21. His goal (as a Victorian-era physician) was to show that
white western Europeans were superior to other races. While those
other labels quickly fell into disfavor, for some reason "mongoloid"
stayed in use until well into the 1970's.
If you are married to a woman who has 3 copies of chromosome 21, I
applaud you. It must take infinite patience.
Chris