How is reagent pronounced?

What does reagent mean?

: a substance used (as in detecting or measuring a component, in preparing a product, or in developing photographs) because of its chemical or biological activity.

Is the H silent in herbicide?

“In British English, herb and its derivatives, such as herbaceous, herbal, herbicide, and herbivore, are pronounced with h. In American English, herb and herbal are more often pronounced without the h, while the opposite is true of herbaceous, herbicide, and herbivore, which are more often pronounced with the h.”

What is the correct way to pronounce experiment in English?