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]

The Collaborative International Dictionary of English v.0.48:

Fishskin \Fish"skin`\, n.
   1. The skin of a fish (dog fish, shark, etc.)
      [1913 Webster]

   2. (Med.) See Ichthyosis.
      [1913 Webster]