aeriform

[ air-uh-fawrm, ey-eer- ]

/ ˈɛər əˌfɔrm, eɪˈɪər- /

having the form or nature of air; gaseous.

unsubstantial; unreal.

Origin of aeriform

First recorded in 1780–90; aeri- + -form

What is the cause of bodies being either solid, liquid, or aeriform?

A Catechism of Familiar Things; Their History, and the Events Which Led to Their Discovery |Benziger Brothers
For it must apparently have formed part of an aeriform mass in which they were immersed at an earlier stage of their history.

A Popular History of Astronomy During the Nineteenth Century |Agnes M. (Agnes Mary) Clerke
Warm dry air, especially when in motion, promotes the aeriform transpiration, by favouring evaporation.

The Action of Medicines in the System |Frederick William Headland
Personally I prefer the aeriform fluid in front of the curtain.

Nat Goodwin's Book |Nat C. Goodwin

According to the views we have mentioned, we must ascribe life to a gas, that is, to an aeriform body.

A Strange Story, Complete |Edward Bulwer-Lytton

aeriform

/ (ˈɛərɪˌfɔːm) /

having the form of air; gaseous

unsubstantial