The Collaborative International Dictionary of English v.0.48:

Leucoma \Leu*co"ma\ (l[-u]*k[=o]"m[.a]), n. [NL., fr. Gr.
   ley`kwma, fr. leyko`s white.] (Med.)
   A white opacity in the cornea of the eye; -- called also
   albugo.
   [1913 Webster]

WordNet (r) 3.0 (2006):

leucoma
    n 1: eye disease consisting of an opaque white spot on the
         cornea [syn: leukoma, leucoma]