I had known that locus is pronounced with a hard 'c'; so I simply extrapolated the hard 'c' to its plural [loci]. I can't pinpoint why, but fortunately, I doubted my guess and was shocked that instead, a SOFT 'c' features in loci. (Sorry; I still haven't learned phonetics yet)
1. Are there any reasons for this astounding difference (in a letter`s pronunciation, between the singular and plural of the same noun)? Could I have foreseen the difference?
2. Can anyone please divine why I might have suspected myself? I'm just curious.