microgravityn.

1975 Science Feb. 527/1 The experiments chosen to fly on the various Skylab missions are best characterized as a mixed bag of studies designed to observe the effect of microgravity on a variety of phenomena.

1978 Nature 13 July 106/2 This will be a microgravity mission, concentrating on experiments on material science and life science in weightlessness.

1988 New Scientist 28 July 50/1 Research should be done on gravity, radiation exposure, environmental toxicology, nutrition, how the body reacts to microgravity and the psychology of living in a closed environment.

1996 Sci. Amer. June 39/3 Even in the absence of vibrations, zero-gravity conditions in orbit can be approached only at a ‘sweet spot’ that is the station's center of mass; other locations have levels that are measured in units of millionths of Earth-gravity, hence the term ‘microgravity’.

1998 L. A. Graf & M. J. Friedman War Dragons iv. 52 The rest had drifted through and were now spinning aimlessly in the station's microgravity.