Without fluid; denoting a form of barometer without mercury, in which the varying air pressure is indicated by a pointer governed by the movement of the elastic wall of an evacuated chamber. Also used to denote a mercury-free pressure gauge used with some sphygmomanometers.
[G. a- priv. + nēros, wet, + eidos, form]
Search Stedman's Medical Dictionary
Examples: glitazone, GI cocktail, etc.