limbus
Concise Oxford English Dictionary © 2008 Oxford University Press:
limbus /ˈlɪmbəs/
▶noun (pl. limbi /-bʌɪ/) Anatomy the border of a structure, especially the junction of the cornea and sclera in the eye.
– origin ME: from L., ‘edge, border’.
'limbus' also found in these Oxford entries:

