How do you pronounce hecatonchires?

hek-uh-ton-ki-reez

Here's a breakdown:

* hek- as in "heck"

* uh- as in "up"

* ton- as in "ton"

* ki- as in "key"

* reez as in "trees"

It's a bit of a mouthful, but with practice, you'll get it!