interplanetary

adjective

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

: existing, carried on, or operating between planets

interplanetary dust

an interplanetary flight

interplanetary spacecraft

Examples of interplanetary in a Sentence

Recent Examples on the Web

Also on Holzherr, humble homesteaders the Knoll family brace for the intrusion of Krem (Matthias Schoenaerts, with more facial piercings than Hellraiser’s Pinhead), leader of a band of interplanetary Brigands. — David Rooney, HollywoodReporter, 24 June 2026

Dunk, Welly and Shirm are on the interplanetary run from a zealous-yet-inept officer of the law named Zandro. — Andreas Wiseman, Deadline, 22 June 2026

His autodidactic impulses may lead him to the history of clock towers or to the interplanetary rarity of wood. — Paige Williams, New Yorker, 22 June 2026

Ones with wide fields of view and sensitive detectors can easily spot these incoming bits of interplanetary jetsam and gather data on their brightness, size, speed and direction. — Phil Plait, Scientific American, 12 June 2026

Word History

First Known Use

1691, in the meaning defined above

Rhymes for interplanetary

• beneficiary
• bronchopulmonary
• evolutionary
• expeditionary
• extramedullary
• extraordinary
• extrapulmonary
• genitourinary
• geostationary
• hepatobiliary
• illocutionary
• insurrectionary

Kids Definition

interplanetary

adjective

in·​ter·​plan·​e·​tary

ˌint-ər-ˈplan-ə-ˌter-ē

: between planets

interplanetary space

interplanetary travel