How to delete a keyword from multiple images?

Hi to you all,

I was adding keywords after looking up on the Image Quality Professor's always very helpful blog on how to do that.

I might have done something wrong as now all my images have, among others, also the keyword "new keyword" attached to them. This happened by either using the enter or the tab key after adding a new keyword, as was hinted at in the blog in order to save a keyword - perhaps I misunderstood that?

It is easy to delete that keyword from a single image. But I could not find a way to batch process deleting a keyword. As 896 images have this particular keyword attached, I am looking for a way to delete this very keyword in one go.

I am on a Mac running CO Pro 7.2.1 and am using sessions.

Any suggestions?

Cheers,
Remko

EDITED: supplied some additional info