Source : Webster's Revised Unabridged Dictionary (1913)

Hordeolum \Hor*de"o*lum\, n. [NL., fr. L. hordeolus, dim. of
   hordeum barley.] (Med.)
   A small tumor upon the eyelid, resembling a grain of barley;
   a sty.

Source : WordNet®

hordeolum
     n : an infection of the sebaceous gland of the eyelid [syn: {sty},
          {stye}, {eye infection}]