My dictionary has the meaning, but it adds 'usually in combination', eg well-read. I don't think I've ever heard anyone use it by itself in the way you have.
Some specific uses of words occur only in certain combinations. He can be a well-read man, but he can't just be "a read man." No one would know what you were talking about (perhaps partly because of the possible confusion with "red" if spoken or with the verb "read" if written).
Similarly, one can be "wined and dined" (served lavishly with wine and food) but you can't just say "he was