Bell's palsy

Wiktionary

1. n. A paralysis of cranial nerve VII (the facial nerve) resulting in inability to control facial muscles on the affected side.

GNU Webster's 1913

1. Paralysis of the facial nerve, producing distortion of one side of the face.
2. n. paralysis of the facial nerve, producing distortion of one side of the face; -- so called from Sir Charles Bell, an English surgeon who described it.