| Expression | Cut down to | Comment |
|---|---|---|
| helicopter | chopper | |
| helicopter | helo | |
| hemispherical cylinder head | hemi | actually, the whole vehicle with an engine with such a cylinder head is also called hemi... just like a Soviet was a guy who was a member of a soviet (a council) in Soviet union. And USSR was laughed at for using the same word at three levels. |
| hydrocarbonate | carb |