My first thought was, good for you, USPTO. My second thought was to check Wikipedia, and in fact, there was no article on "multitouch" until January 10, 2007, so Apple probably did in fact make this term themselves. So 'multitouch' is probably as rightfully Apple's as 'iMac.' Maybe they should've called it iMultitouch.
(Of course they didn't invent multitouch, but they did invent the term, and this is a trademark, not a patent.)
http://en.wikipedia.org/w/index.php?title=Multi-touch&dir=prev&action=history
E: My third thought was to actually read the initial Wikipedia article (
http://en.wikipedia.org/w/index.php?title=Multi-touch&oldid=99852927), and it looks like Apple doesn't deserve it after all, though they did make it a popular term. Probably Jeff Han
http://cs.nyu.edu/~jhan/ftirtouch/ or someone should get it. E2: Unless Apple bought that guy's technology, in which case I guess they should own the trademark too.