The term Butcher Block has two meanings. The original meaning comes from the blocks Michigan Maple Block and Bally Block manufactured in the late 1800s. These blocks were End Grain construction and were the cutting surface of choice of the commercial meat cutting industry. Every butcher on every corner had a butcher block.
Today the term has also come to mean Edge Grain Construction. Over the years butchers wanted smaller and more portable versions of the solid Maple butcher block End Grain blocks they had used for years. Edge grain cutting boards were developed. These have become very common. With the increase in popularity of these boards the definition of butcher block expanded to include edge grain construction with the appearance of butt joints in some of the laminations.