atopic
Concise Oxford English Dictionary © 2008 Oxford University Press:
atopic /eɪˈtɒpɪk/
▶adjective denoting a form of allergy in which a hypersensitivity reaction such as eczema or asthma may occur in a part of the body not in contact with the allergen.
– derivatives
atopy /ˈatəpi/ noun.
atopy /ˈatəpi/ noun.
– origin early 20th cent.: from Gk atopia ‘unusualness’.
'atopic' also found in these Oxford entries:

