To Meld – What Does “Meld” Mean?

And like me, did you “learn” the meaning from the Vulcan mind-meld?  (Continuing a discussion with Michelle from comments to an earlier post.)  I have to say, I did “learn” the word by hearing its repeated use on Star Trek.  To meld, so far as I’ve ever been concerned, means … whatever it is that Spock did with his mind.  Feel free, Oh Ye Prescriptivists, to correct me in the comments.