>"dissemia"

If you use Google http://www.google.com as your search engine of choice you will find that it often suggests a better spelling - it is great for people like me who have a rough idea but don't always know the correct spelling. I've just tried it and it worked in this case.

The dictionary site http://www.onelook.com is also very good, you can try a few options pretty quickly and see what it can find. It is particularly good for words where there is a difference between US and Uk usage as the smaller dictionaries tend to skip words which are not common in the country that produced the dictionary.

Good luck, we've got a bit of a start on you.