Do a line over the letter o mean without?

No, a line over the letter "o" does not mean "without". It's a diacritical mark used in different languages for various purposes, but not to indicate "without".

Here are some common uses of the line over "o":

* Spanish: The tilde (~) over the "o" changes the pronunciation, like in "año" (year).

* French: The circumflex (^) over the "o" indicates a historical change in pronunciation, often replacing a missing "s", like in "hôpital" (hospital).

* Czech: The caron (ˇ) over the "o" changes the sound to something like "oh" in English, like in "škola" (school).

To indicate "without" in English, we usually use prefixes like "un-", "non-", "in-", or the preposition "without".