canthus

SYLLABICATION: can·thus
PRONUNCIATION: knths
NOUN: Inflected forms: pl. can·thi (-th)
The angle formed by the meeting of the upper and lower eyelids at either side of the eye.
ETYMOLOGY: Late Latin, from Greek kanthos.

Hence the name of the epicanthic fold characteristic of those from E. Asia

Bingley

And so epi? How now?

Greek epi = on. It's a fold of skin on the canthus, that gives people from that part of the world the narrow-eyed look.

Bingley

From my JDM®, it's a cold weather adaptation. The little fold helps protect the eye from the cold Norland blasts.