gaso

Most words drift into a language over centuries and nobody can say who started it. Gaso is not one of those. Jan Baptist van Helmont, working in the Low Countries in the first half of the seventeenth century, kept producing a substance that was neither liquid nor solid and had no name, and he invented one for it out of the Greek khaos - the formless void, the empty space before things had shape. He wrote the word down in Dutch spelling, it went into French and English within a century, and from there into essentially every language on earth, including this one. Gaso and kaoso are the same word twice, four hundred years apart.

The regular derivations all work: gasa gaseous, gasigi to turn something into a gas, gasujo a gas cylinder, gasforno a gas cooker.

One warning, and it catches American learners rather than British ones. Gaso never means petrol. The fuel in a car is benzino, and a request for gaso at a filling station will produce blank looks. This is exactly the class of trap the false friends article exists for: a word that is identical in form, identical in one sense, and quietly wrong in the sense you happen to want.