aer·i·form
| \ ˈer-ə-ˌfȯrm \
Definition of aeriform
1
: having the nature of air : gaseous
2
: lacking substance or real existence : intangible
figures light and aeriform come unlooked for and melt away— Thomas Carlyle
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Merriam-Webster unabridged
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Time Traveler for aeriform
The first known use of aeriform was in 1781
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