Does anyone knows of an Apple OS X alike dictionary for Windows? No, I am not looking for WordWeb. I am looking for something very similar to the one on OS X.
To my knowledge, there is no dictionary for windows that closely resembles the OS X built-in dictionary tool. There are however a few which have similar functionality, but none that I know of that allows you to update the dictionary contents as you move the mouse across other words (which is a shame).
I'm unsure as to why you don't want WordWeb. But being that the case, you have other alternatives you may wish to explore.
A rather complete one is Everest Dictionary. Includes a Glossary, Translator and even Regular Expressions searching in addition to allowing you to get the meaning of a word by integrating with about any application displayed text, of course.