Relative (Zulu part of speech)

Didn't want to hijack your thread, but if a "relative" is what you describe, then we are missing a sense at relative. I wonder if you could add it. Thanks.

I'm not quite sure what it is myself, I only know that it is 'not an adjective, but acts similar to one'. It's apparently part of established practice for Zulu and other Bantu languages, and the main online dictionary for Zulu www.isizulu.net uses the term with the assumption that the user is already familiar with it. But I haven't been able to find a good explanation of what it actually is, yet.