IPA: /ˈmʌltiˌspid/
KK: /mʌltiˈspid/
Able to work at different speeds.
The multispeed fan allows you to choose how fast you want it to run.
Multispeed → It is formed from "multi-" (meaning many) and "speed" (from Old English "spēd", meaning success or prosperity, but in modern usage refers to the rate of motion). The word "multispeed" means having many different speeds or rates of motion.
Think of 'many' ('multi-') speeds — that's why multispeed refers to having multiple rates of motion.
No commonly confused words.