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perforin
perform
performance
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periapsis
per·i·ap·sis [ pèrree ápsiss ] (plural per·i·ap·si·des [ pèrree ápsi dz ])


noun 
Definition:
 
astronomy nearest point in orbit: the point in an orbit that is nearest to the center of gravitational attraction
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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