Condition of being atretic, occluded, or closed; indicated in compound words by the prefix atreto- or the suffix -atresia. [L. im- neg. + per-foro, pp. -atus, to bore through]
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im·per·fo·ra·tion (im-pur″fə-raґshən) the state of being abnormally closed; see also atresia.Medical dictionary. 2011.