--- In BardonPraxis@yahoogroups.com, Jonathan Bell <bell_jonathan@y...> wrote: > > I remember getting confused by the same thing too! I think I looked in the dictionary, and both quadra and tetra mean 'four' but one is from greek roots and the other from latin?? is that correct, or am I just talking rubbish? :o) Yeah, thanks Jonathan, I just checked too and you're spot on. I knew Quadra- came from Latin and indicated 'four' but I hadn't heard of 'tetra' until I saw the word tetrapolar. Thanks for information :-) Martin