a·top·ic ( -t p  k)adj. Of, relating to, or caused by a hereditary predisposition toward developing certain hypersensitivity reactions, such as hay fever, asthma, or chronic urticaria, upon exposure to specific antigens: atopic dermatitis. [From Greek atopi , unusualness, from atopos, out of the way : a-, not; see a-1 + topos, place.]at o·py ( t -p ) n. |
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