Plural of atopy; various genetic allergic conditions like asthma, eczema, and hay fever that run in families.
From atopy (Greek atopos 'out of place') + -ies plural suffix. Medical term for the condition itself, not its triggers or symptoms.
Atopy creates the 'atopic triad'—asthma, eczema, and hay fever often appear together in families because they share the same genetic allergy tendency.
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