The Collaborative International Dictionary of English v.0.48:

Trachoma \Tra*cho"ma\, n. [NL., fr. Gr. ? roughness, fr. ?
   rough.] (Med.)
   a contagious granular conjunctivitis caused by the bacterium
   Chlamydia trachomatis. It is a chronic inflammation of the
   conjunctiva -- Tra*chom"a*tous, a.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

trachoma
    n 1: a chronic contagious viral disease marked by inflammation
         of the conjunctiva and cornea of the eye and the formation
         of scar tissue