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apsis

ap·sis [ ápsiss ] (plural ap·si·des [ ápsi dz ])


noun 
Definition:
 
1. nearest or farthest point in orbit: either of the two points in an orbit that are nearest to and farthest from the center of gravitational attraction

2. buildings 
Same as  apse (sense 1)


[Late 16th century. Via Latin< Greek (h)apsis "rim of a wheel, wheel, arch, vault"]
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