gas
matter, neither solid nor liquid
Today this word meansThe state of matter that is neither solid nor liquid.
Coined in the early 1600s by the Flemish chemist Van Helmont.
By his own written account, he made the new word by rendering Greek khaos in the pronunciation of his own language.
Worth noting
This rests on Van Helmont's own statement, though some also see the influence of Dutch geest ("spirit") and the like.