interplanetary

adjective in·ter·plan·e·tary \ ˌin-tər-ˈpla-nə-ˌter-ē \

Definition of interplanetary

: existing, carried on, or operating between planets
  • interplanetary dust
  • an interplanetary flight
  • interplanetary spacecraft

First Known Use of interplanetary

1691

in the meaning defined above

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