Hello everyone!

There are several odd words that I came across recently - like 'radius' or 'phenomenon'. Some people would use such plural form as 'radii' and 'phenomena'. Does it come from Latin? Would it be grammatically correct to say 'radiuses' and 'phenomenons'?
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Comments  (Page 2) 
pretty sure that phenomena has greek origins...
What do you suggest doing with people who use "phenomena" in the singular because they think it sounds more intelligent?
Students: Are you brave enough to let our tutors analyse your pronunciation?