The most common and accepted pronunciation is:
* Kuh-THOO-loo
Here's a breakdown:
* Kuh: Like the "cuh" in "cup"
* THOO: Like the "thoo" in "tooth"
* loo: Like the "loo" in "loop"
Important Notes:
* No "l" sound at the end: The final "u" is silent.
* Emphasize the "THOO" sound: This is the most distinctive part of the pronunciation.
You might also hear it pronounced with a more guttural sound for the "Kuh" and "THOO", but the above is the most widely accepted.