inertial upper stage
noun
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
Compare
payload assist module.
Words nearby inertial upper stage
inertial guidance,
inertial mass,
inertial observer,
inertial platform,
inertial system,
inertial upper stage,
inescapable,
inescutcheon,
inessential,
inessive,
inestimable