Hi Jim,
Well I think that in woodworking the meaning is quite clear, and without really stirring up a big "stink"....to book match, say a table top, a piece of wood is split and then reglued edge to edge to give it that "mirrored" look. I have a rod with bookmatched tips and about all I can tell you about it is, the tips look identical with node spacing, position with relationship to the guides etc. except one is 180 degrees from the other. Ron Kusse could probably give the term in bamboo rod making more clear definition....