<unk>  (pl. canthi, palpebral commissures) is either corner of the eye where the upper and lower eyelids meet. More specifically, the inner and outer canthi are, respectively, the medial and lateral ends/angles of the palpebral fissure. The bicanthal plane is the transversal plane linking both canthi and defines the upper boundary of the midface.
Canthus
Ateronon
Microgyrus
Ayer's Sarsaparilla
Syrinx 
Tophus
Gyrus
Hemotympanum