Here's how you pronounce it:
* ah-mee-kee-si-mus
The emphasis is on the first syllable: ah.
Here's a breakdown of the pronunciation:
* ah - like the "a" in "father"
* mee - like the "me" in "me"
* kee - like the "kee" in "keep"
* si - like the "si" in "sister"
* mus - like the "mus" in "music"