Definition of "aeriform" []

• Pertaining to air, or having a form similar to that of air. (adjective)
• Light, unsubstantial, or unstable. (adjective)

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• "Humboldt extends this view to the case of earthquakes unaccompanied by eruptions; but I can hardly conceive it possible that the small quantity of aeriform fluids which then escape from the fissured ground can produce such remarkable effects."
• "Arguing thus, Priestley, of course, named the new aeriform substance _dephlogisticated air_, and thought of it as ordinary air deprived of some, or it might be all, of its phlogiston."
• "The reversed currents are, then, arrested during their passage; and, in order to collect them, it becomes necessary to considerably diminish the gaseous pressure of the aeriform conductor interposed in the discharge; to increase its conductivity; or to open to the current a very resistant metallic derivation."