xeroderma
Concise Oxford English Dictionary © 2008 Oxford University Press:
xeroderma /ˌzɪərə(ʊ)ˈdəːmə, ˌzɛ-/
▶noun any of various diseases characterized by extreme dryness of the skin, especially a mild form of ichthyosis.
'xeroderma' also found in these Oxford entries:

