Word Study
periapsis
WORDNET DICTIONARY
Noun periapsis has 1 sense
- periapsis(n = noun.location) point of periapsis - (astronomy) the point in an orbit closest to the body being orbited; Array is a kind of celestial point
is a part of celestial orbit, orbit
has particulars: perigee, perihelion, perijove, perilune, periselene
Antonym: apoapsis
For further exploring for "periapsis" in Webster Dictionary Online