What is the vowels for c that sounds like s?

You're likely thinking of the "c" sound that occurs before the vowels i and e.

When "c" appears before the vowels i or e, it's often pronounced like an "s" sound.

Here are some examples:

* ce: center, celebrate, cereal

* ci: city, circle, civil

However, it's important to note that there are exceptions to this rule, especially with words of foreign origin. For instance, the "c" in "cello" and "circa" is pronounced with a "k" sound.