a full splice cue is a cue in which the butt is made from two interlocking pieces of wood. Look at the traditional house cue and where you see the dark points go into the lighter forearm/shaft wood, that is a splice. Because the points are of the same wood that the handle is, there is no other connection made in the butt, therefore it is 'full splice'. A half splice uses more than one piece of wood to create the points--one piece per point. These will always have some kind of glue joint right under the points. A merrywidow or plain jane would be the opposite, no points whatsoever.
2. Veneers are different woods (many times dyed) that are glued onto the points before inserting the points into the forearm. These appear as stripes on the edges of the visible points.
3. A durometer is a piece of equipment used to determine the hardness of any material. There are several scales of hardness including rockwell (a,b and c) and mohr. Some people use these to measure tip hardness and i believe it is a waste of time.
Dld