inertial upper stage
a U.S. two-stage, solid-propellant rocket used to boost a relatively heavy spacecraft from a low earth orbit into a planetary trajectory or an elliptical transfer orbit. Abbreviation: IUS
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- inertial guidance,
- inertial mass,
- inertial observer,
- inertial platform,
- inertial system,
Compare payload assist module.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019