Search Result for "periapsis": 
Wordnet 3.0

NOUN (1)

1. (astronomy) the point in an orbit closest to the body being orbited;
[syn: periapsis, point of periapsis]


WordNet (r) 3.0 (2006):

periapsis n 1: (astronomy) the point in an orbit closest to the body being orbited [syn: periapsis, point of periapsis] [ant: apoapsis, point of apoapsis]