from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A rocket engine that develops thrust by expelling ions rather than gaseous combustion products.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun astronautics a type of spacecraft propulsion, whereby
electric fieldsaccelerate ionsout the exhaust to provide motive force
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a type of reaction-propulsion engine to propel rockets in space; a stream of positive ions is accelerated to a high velocity by an electric field
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