"mal-TAY-zhun" was the pronunciation for Maltasion from the script pronunciation guide. 
There is a discrepancy in the spelling of this belt's name in the script. In the pronunciation guide, it was spelled Maltasion, whereas, in the script's text, it was spelled Meltasion. The Star Trek Encyclopedia (4th ed., vol. 2, p. 34) and Startrek.com favored the latter.