Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

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

from the GNU version of the Collaborative International Dictionary of English

  • adj. Having the form or nature of air, or of an elastic fluid; gaseous. Hence fig.: Unreal.

from The Century Dictionary and Cyclopedia

  • Having the form or nature of air, or of an elastic invisible fluid; gaseous. The gases are aĆ«riform fluids.
  • Figuratively, unsubstantial; unreal.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. characterized by lightness and insubstantiality; as impalpable or intangible as air
  • adj. resembling air or having the form of air

Etymologies

aeri- + -form. (Wiktionary)

Examples

  • 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.

    Journal of researches into the geology and natural history of the various countries visited by H.M.S. Beagle

  • 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 Story of Alchemy and the Beginnings of Chemistry

  • 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.

    Scientific American Supplement, No. 344, August 5, 1882

  • On page 214 he describes and figures an apparatus for taking the galvano-electric spark into fluid and aeriform substances.

    Scientific American Supplement, No. 430, March 29, 1884

  • With the help of these qualitative concepts we are now in a position to determine more clearly still the difference between the older and the modern conceptions: in particular the difference between the aeriform condition of matter, as we conceive of it to-day, and the element Air.

    Man or Matter

  • We know that this characteristic of matter diminishes gradually with its transition from the solid to the liquid and aeriform states.

    Man or Matter

  • Thus there is reason to describe also from the modern point of view the solid and liquid states as essentially 'cold', and the aeriform state as 'warm'.

    Man or Matter

  • But aeriform matter still has density and weight, and this means that matter in this state combines the two opposing qualities.

    Man or Matter

  • Heat, therefore, does not rank as a fourth condition by the side of the solid, liquid and aeriform states, in the way that Fire ranks in the older conception by the side of Earth, Water and Air.

    Man or Matter

  • Through this process matter passes over from the aeriform condition into that of numerous separate, characteristically structured solid bodies - the starch grains.

    Man or Matter

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