relating to a form of allergy where there is a reaction in a part of the body that does not have direct contact with the thing causing the allergy特應性的,異位的(指過敏部位並非直接接觸過敏原)
Word Originearly 20th cent.: from Greek atopia ‘unusualness’, from atopos ‘unusual’, from a- ‘without’ + topos ‘place’.