I get really pissed-off. I'm constantly hearing people refer to 'Vaulted Ceilings', where they really mean 'Beamed Ceilings'.
I first noticed this on a TV country-house finding programme; much loved by Lady Magnon. Every bloody house that had nice old beams was referred to as having 'vaulted ceilings'. It drove me nuts!
I've even heard architects (who OUGHT TO know better) wrongly talking of 'vaulted ceilings'.
So, let's get things right. The above illustration is of a vault; either built in stone, concrete, or brick, they are constructed over a template with considerable weight being added to the top to hold it all together once the template is removed.
A beamed ceiling is constructed of wooden beams that hold either an upper floor, or a roof.
Amazingly, when I was looking for a good illustration, I referred to Google Images and found almost nothing but photos of beamed ceilings. The rot has set-in even further than I'd imagined.
I don't know why this should annoy me as much as it does; the problem is, there are far too many people who claim to be experts, but who obviously aren't. Just look in any Estate Agent's window for proof.