Bedrockgames
I post in the voice of Christopher Walken
I don't think US Americans pronounce Centaur as Cen-tar.
It is pronounced more like Cen-Ta-ur. So that would be Sin-Tah-Uhr.
It is NOT pronounced like the US Americans pronounce Dinosaur (Di-No-Soor).
Albeit, the Canadians may pronounce it that way (as I think indicated by @FitzTheRuke above me states...Sin-Toors or Sin-Toh-Ars.
Edit PS: As long as we are on spelling and speaking...things that confused me when I was younger...probably from switching back and forth between the UK and the US at various times...
Is it color...or colour?
Is it Center...or Centre?
Drove me nutty at times.
My guess this is very regional. Like Aunt, drawer, and similar words. Things are pronounced differently in different parts of the country