Definition of interplanetary in English:

interplanetary

Syllabification: in·ter·plan·e·tar·y
Pronunciation: /ˌin(t)ərˈplanəˌterē
 
/

adjective

Situated or traveling between planets: interplanetary missions
More example sentences
  • Fragments of asteroids and comets pervade interplanetary space.
  • Orion was originally designed as an interplanetary spacecraft for missions to the Moon or Mars, but the design was adapted for interstellar travel.
  • Its principal responsibilities are to support interplanetary spacecraft missions and radio and radar astronomy observations.

Definition of interplanetary in:

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Word of the day neoteny
Pronunciation: nēˈätn-ē
noun
retention of juvenile features in the adult animal