Canthus

from WordNet (r) 3.0 (2006)

canthus
    n 1: either of the corners of the eye where the upper and lower
         eyelids meet

from The Collaborative International Dictionary of English v.0.48

Canthus \Can"thus\, n.; pl. {Canthi}. [NL., fr. Gr. ?.] (Anat.)
   The corner where the upper and under eyelids meet on each
   side of the eye.
   [1913 Webster]