Word derivation for "fifteen" :
Basque = hamabost (from ten + five)
Finnish = viisitoista (five + -teen)
Miresua = vositima (five + -teen)
Another new number word. This one is more Finnish than Basque, but I think not unreasonably so.
When I originally posted this, I wasn't sure if the word fifteen occurred in Alice's Adventures in Wonderland or not. I didn't have a searchable text handy. Now I can happily say fifteen appears once in the book.
"...she came upon a low curtain she had not noticed before, and behind it was a little door about fifteen inches high: she tried the little golden key in the lock, and to her great delight it fitted!"