The Collaborative International Dictionary of English v.0.48:

Otologist \O*tol"o*gist\, n.
   One skilled in otology; an aurist.
   [1913 Webster]

WordNet (r) 3.0 (2006):

otologist
    n 1: a physician who specializes in the ear and its diseases
         [syn: ear doctor, ear specialist, otologist]