Canthus n. : The corner where the upper and under eyelids meet on each side of the eye.

Example:
I was once told when the Canthus were visible it was a sign of ill health in the cat - anyone hear of this?

Taxonomy
Canthus, free encyclopedia, medial canthus, eyelids, internal canthus, canthi, commissura, the eye, palpebral commissures, left eye, corner of the eye, palpebrarum lateralis, search, Unsourced, upper and lower, upper boundary, Pathology, lateral palpebral commissure.

Defination from the web:
canthus) is prolonged for a short distance toward the nose, and the ... Canthus • Eyelash • Ciliary glands • Palpebral fissure. Lacrimal apparatus ...