from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Motion sickness caused by sustained weightlessness during space flight, usually accompanied by disturbance of the inner ear.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. motion sickness caused by the weightlessness of space flight
from the GNU version of the Collaborative International Dictionary of English
- n. a group of symptoms, prominently nausea, but sometimes including lethargy, headache, and sweating, occuring under the weightless conditions of space flight.
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