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atomic mass
atomic mass unit
atomic number
atomic particle
atomic physics
atomic radius
atomic reactor
atomic theory
atomic veteran
atomic weight
atomicity
atomise, etc
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atopic

a·top·ic [ ay tóppik, ə tóppik ]


adjective 
Definition:
 
allergic: describes a medical condition that is caused by a hereditary tendency to react to specific allergens, as in hay fever, some skin irritations, and asthma

[Early 20th century. < Greek atopia "unusualness" < atopos "out of place" < topos "place"]

at·o·py [ áttəpee ] noun
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