| atrial septal defect |
an abnormal opening between the left and right atria of the heart
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| atm |
standard atmosphere: a unit of pressure: the pressure that will support a column of mercury 760 mm high at sea level and 0 degrees centigrade asynchronous transfer mode: a means of digital communications that is capable of very high speeds; suitable for transmission of images or voice or video as well as data; "ATM is used for both LAN and WAN" cash machine: an unattended machine (outside some banks) that dispenses money when a personal coded card is used
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| atomic mass |
(chemistry) the mass (in atomic mass units) of an isotope of an element
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| atrioventricular |
relating to or affecting the atria and ventricles of the heart; "atrioventricular disease"
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| atonia |
atonicity: lack of normal muscular tension or tonus
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