Do you use "mould" or "mold"?

I've always thought that mold is the fungus, and to mould is to shape. When talking about it with my colleagues yesterday, I was surprised that this isn't common. Most people use one of the two spellings to refer to both.

Doing a quick search on duckduckgo also confirms that:

mould is the British spelling referring both meanings.
mold is the american spelling referring to both meanings.

In my quest to prove them wrong, I was surprised at how wrong I was... until I discovered a few people on the internet who said the same thing:

I'm not looking for what's correct or incorrect anymore, I just find it very fascinating that there are some people who use the words similarly to me, but the vast majority of others who use it in a different way.

So: what's the difference between mould and mold according to you?

49 comments

Moulding is the trim around walls and whatnot. Molding is when something is in the process of having mold growing on it.
- Wouldn't that be mouldering?
  
  Maybe. I honestly don't know. Not really my field of expertise.
  
  Moldering: "to crumble into dust, to rot"
  All the definitions of molding I can find, are about shaping something.