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/ˈeɪ.tə.pi/
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/ˈeɪ.tə.pi/
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/ˈætəpi/
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/ˈætəpi/
Plural
atopies
Atopy is a genetic tendency to develop allergic diseases like eczema, asthma, and hay fever — it's your body's overzealous, misplaced immune response to everyday things like pollen or dust mites. Think of it as having an 'allergy-prone wiring' that makes your immune system mistake harmless substances for dangerous invaders and launch an unnecessary alarm.
Children with a family history of asthma are more likely to develop atopy.
Atopy often begins in infancy with atopic dermatitis before progressing to allergic rhinitis or asthma — a pattern known as the atopic march.
Her persistent sneezing and itchy eyes during spring strongly suggest underlying atopy.
Doctors may measure serum IgE levels to help confirm a diagnosis of atopy.
Not all allergies stem from atopy — some, like contact dermatitis from nickel, are non-atopic and T-cell mediated.
topo
Comes from the Greek noun 'topos' (τόπος), meaning 'place' or 'location'. In medical terminology, it evolved via 'atopy' (coined by Coca & Cooke in 1923) to denote a localized, site-specific hypersensitivity reaction — literally 'out of place' (a- + topos), reflecting the abnormal, site-targeted immune response. Examples include topology (study of spatial properties), topography (description of places), epitope (antigenic 'site'), and atopy itself.
a-
Comes from the Greek prefix 'a-' (alpha privative), meaning 'without', 'not', or 'lacking'. In 'atopy', it negates or alters the meaning of 'topos', suggesting an aberrant or dysregulated response to environmental triggers — not a normal localized reaction, but a pathological one misdirected in place and timing. Examples include atypical (not typical), amoral (without moral judgment), and aphasia (loss of speech).