How to pronounce “halcyon” in English

It was a halcyon time.

But even in those halcyon early internet days, we got into flame wars.

And during the 20 years I practiced medicine, while I was practicing medicine at Laguna Honda, we eventually got discovered and our halcyon days

I like elegant, flowery words, such as estivates, peregrinates, elysium, halcyon.