Hubwards

Translation: по направлению к центру (Диска)
Meaning: The main idea is that if you are standing on a disc, and face the hub or center of the disc, then you are oriented hubwards. The opposite orientation is rimwards (quoted from here). Derives, obviously, from hub - "the center, focal point"
Reason: One more Pratchett's super-descriptive word, used to explain the geography of the Discoworld. I didn't mark the place in the book where I met this word, so will supply the example later.