Everywhere I've checked for pronunciations online it's CO-IT-TUS. Every time I've heard someone use it in real life it's COY-TIS. Since so many people pronounce it in the latter form, does that mean the original pronunciation is "dead"?
closed as general reference by tchrist, aedia λ, Kristina Lopez, Mitch, Robusto Mar 5 '13 at 13:11
This question is too basic; it can be definitively and permanently answered by a single link to a standard internet reference source designed specifically to find that type of information.If this question can be reworded to fit the rules in the help center, please edit the question.
This is one of those cases where both pronunciations are correct. CO-it-tus is indeed the traditional pronunciation, as backed up by OED (see FumbleFingers' comment above). However, COY-tis has become the default pronunciation, probably because of people who see the written form guessing at the pronunciation (as suggested by FumbleFingers again and mplungjan). As both versions are in relatively heavy use (considering how infrequently the word arises), then it seems clear that both versions are currently correct. In a generation, it's quite possible that the CO-it-tus variation will have died out, as you suppose has happened already, but evidence appears to show that it is not the case yet.