agraphia
noun
agraph·ia (ˌ)ā-ˈgra-fē-ə 
: the pathologic loss of the ability to write
Word History
Etymology
a- entry 2 + Greek -graphia -graphy, probably after German Agraphie or French agraphie
First Known Use
1565, in the meaning defined above
Medical Definition
agraphia
noun
agraph·ia (ˈ)ā-ˈgraf-ē-ə
: the pathological loss of the ability to write