| canthomeatal plane | Plane passing through the two lateral angles of the eye and the centre of the external acoustic meatus; this plane lies approximately midway between the Frankfort and the supraorbitomeatal plane's. (05 Mar 2000) |
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| canthoplasty | 1. An operation for lengthening the palpebral fissure by incision through the lateral canthus. Synonym: cantholysis. 2. An operation for restoration of the canthus. Origin: G. Kanthos, canthus, + plasso, to form (05 Mar 2000) |
| canthorrhaphy | Suture of the eyelids at either canthus. Origin: G. Kanthos, canthus, + rhaphe, suture (05 Mar 2000) |
| canthotomy | Slitting of the canthus. Origin: G. Kanthos, canthus, + tome, incision (05 Mar 2000) |
| canthus | The angle of the eye. Origin: G. Kanthos, corner of the eye (05 Mar 2000) |