"epicanthal fold" not in OED

[Ronald Butters]

OED has EPICANTHUS  "A downward fold of skin which sometimes covers the inner angle or canthus of the eye, esp. in Mongols" and EPICANTHIC as a derivative. But OED does not have the usual anatomical derivative, EPICANTHAL, seen most frequently in EPICANTHAL FOLD (which usually accompanies eyes that exhibit a PALPEBRAL SLANT). 

And what the heck is a "Mongol"? Isn't this extremely outdated terminology for those Asians who quite normally--genetically--exhibit PALPEBRAL SLANT with EPICANTHAL FOLD? 

Or does the OED mean to indicate persons with DOWN SYNDROME (formerly known as MONGOLOIDISM)? If so, this would seem to erase most persons of Chinese and Japanese descent from consideration as interested readers of OED--or to view their eyes as some kind of genetic defect, which I am sure that the OED does not intend--at least not since the very early 20th century).

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