Mobireader reads mobi dictionaries, of course, but you might want to look into conversion to another format.
My script
PocketBookDic converts from a.o. mobi to xdxf- and pocketbook and stardict-format (both xml and binary). However, the succes rate varies as the mobi-format is rather non-uniform.
If it fails and the dictionaries are interesting, I am willing to look at tweaking the script for some dictionaries.
Support thread for the script on mobileread is
here.