ichthyosis

from WordNet (r) 3.0 (2006)

ichthyosis
    n 1: any of several congenital diseases in which the skin is dry
         and scaly like a fish

from The Collaborative International Dictionary of English v.0.48

Ichthyosis \Ich`thy*o"sis\, n. [NL., fr. Gr. 'ichqy`s fish.]
   (Med.)
   A disease in which the skin is thick, rough, and scaly; --
   called also {fishskin}. -- {Ich`thy*ot"ic}, a.
   [1913 Webster]