How do you pronounce triduum?

TRIH-doo-əm

Here's a breakdown:

* TRIH: The "i" sound is similar to the "i" in "trip".

* doo: The "oo" sound is similar to the "oo" in "moon".

* əm: The "m" is silent, and the "e" is a short, unstressed vowel sound, similar to the "e" in "the".