Dictionary  space' shut"tle(often caps.) any of several U.S. space vehicles consisting of a reusable manned orbiter that touches down on a landing strip after an orbital mission, two reusable solid rocket boosters that drop off after initial ascent, and an expendable external tank containing liquid propellants. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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