Word Study
canthus
CIDE DICTIONARY
canthus, n. [NL., fr. Gr. .].
The corner where the upper and under eyelids meet on each side of the eye. [1913 Webster]
OXFORD DICTIONARY
canthus, n. (pl. canthi) the outer or inner corner of the eye, where the upper and lower lids meet.
Etymology
L f. Gk kanthos
For further exploring for "canthus" in Webster Dictionary Online