In ancient Greek, ‘όλος’ had an /h/ sound in front of it, and it is the root of such English words as ‘holistic’.
A trick to find such connections from Greek to English is checking out what breathing marks the Greek words had. Rough breathing indicated an /h/ sound, while the smooth breathing indicated no /h/ sound.
All words starting with υ took a rough breathing - ὕπνος becomes hypnos, from ὕδωρ you get υδρο- which becomes hydro-. Ἑλένη is Helen, ἑτερογενής is heterogeneous, ὁμογενής is homogenous etc. ἀλλογενής though becomes allogeneic, no h.
And a quiz question: which is the only European country other than Hellas that starts with έψιλον and was marked with a rough breathing?
Yep! The question was posed to me a few years back by a complete stranger, a Swiss hellenophile with whom I was sharing a cab ride in the middle of the night... :)
Haha, my reason for knowing it isn't as interesting. It's just that I've been reading Asterix :)
It might have been Asterix for me too, I can't really tell. I remember figuring it out then and thinking 'Duh!' straight away. There are not many countries in the list anyway... You just need that little piece of encyclopedic knowledge I guess. But I like it as a 'quiz' question, more so because of the circumstances of that night. :)
It is not pronounced as a separate οι from the one in όλοι, they are just uttered in two beats, like a long vowel sound. The audio is very good for this sentence actually. :)