The Collaborative International Dictionary of English v.0.48:

Varicosis \Var`i*cos"is\, n. [NL. See Varix, and -osis.]
   (Med.)
   The formation of varices; varicosity.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

varicosis
    n 1: pathological condition of being varicose or having varicose
         veins