noun (used with a singular verb)
the science dealing with the effects of space travel on life.

1955–60; bio- + astronautics

bioastronautic, bioastronautical, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bioastronautics (ˌbaɪəʊˌæstrəˈnɔːtɪks)
(functioning as singular) See space medicine the study of the effects of space flight on living organisms

Collins English Dictionary - Complete & Unabridged 10th Edition
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