What does svirfnebli mean, and how is it different to svirfneblin?

A recent answer to a question has led me to obtain an e-book for The Dark Elf Trilogy, and the section I am reading uses the word svirfnebli as well as svirfneblin, but I am unsure if it is a printing issue (or possibly a scanning issue) or an actual word, and I can’t really tell why is it different from svirfneblin.


When the svirfneblin guards ushered him in

Scores of svirfnebli rushed about their posts

Both seem to be referring to multiple deep gnomes, so I am unsure, but this is the first time I have read the word svirfnebli, and it is used multiple times in the short part of the book I have read so far. Does anyone know what it means and how it should be used?

If possible, I would like to know if the use of the words have changed through the editions, maybe in 3rd edition they both had a use and it was simplified for more recent editions?