/ eɪˈtɒpɪk; NAmE -ˈtɑːp-/ adjective
( medical ) 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
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WORD ORIGIN
early 20th cent.: from Greek atopia unusualness, from atopos unusual, from a- without + topos place.