I'm familiar with the IPA characters, but google shows other symbols in its search results. What I want to find is an equivalence table or something to get the IPA characters of any particular word than I'm interested in. Or a tool that brings words as quicky as typing "define book" in my browser's address bar, which is how one can get the Google's result for any world.
I did some investigation and I have determined that the dictionary entries returned by the Google
To determine this, I started the Wikipedia article that compares many of these "pronunciation respelling" systems, and looked up the various example words to see which system on that page most closely matched the system used by the Google dictionary search results. The only scheme that matched perfectly is the one labeled NOAD, for New Oxford American Dictionary.
Furthermore, once I made this determination, I was reminded that the Dictionary app which comes with Mac OS X also gets its data from the New Oxford American Dictionary, and I found that this was indeed the case—the definition content matches exactly.
However, the Wikipedia article on Google Dictionary reports that the content is from Oxford American College Dictionary. In any case, it appears that the content, including pronunciations, comes from the American English department of Oxford Dictionaries.