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atomic weight
atomicity
atomise, etc
atomism
atomize
atomizer
atomy
atonal
atonalism
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atresia
a·tre·sia [ ə trə ]


noun 
Definition:
 
absence of usual body opening: the often hereditary absence of a usual body opening such as the anus or ear canal
[Early 19th century. <a3 + Greek trēsis "perforation"]
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