Word Study
interplanetary
CIDE DICTIONARY
interplanetary, a.
Between planets; as, interplanetary spaces; interplanetary travel. Boyle. [1913 Webster]
THESAURUS
interplanetary
Cynthian, anagalactic, asteroidal, astral, astrologic, astrologistic, astrologous, astronomic, astrophysical, celestial, circumplanetary, cislunar, empyreal, empyrean, equinoctial, extragalactic, galactic, heavenly, heliacal, intercosmic, intersidereal, interstellar, lunar, lunary, lunate, lunular, lunulate, meteoric, meteoritic, nebular, nebulose, nebulous, planetal, planetarian, planetary, planetesimal, semilunar, sidereal, solar, sphery, star-spangled, star-studded, starry, stellar, stellary, terrestrial, uranic, zodiacalFor further exploring for "interplanetary" in Webster Dictionary Online