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The surface against which the side of a plank lies in a rabbetted member. The end fastenings of the plank penetrate the back rabbett of a stem or sternpost; the lower or inner edge fastenings of a plank penetrate the back rabbett of a keel or horn timber.
Rabbett line = Outer Rabbett Line
Apex Line = Middle Rabbett Line, Margin Line
Bearding Line = Back Rabbett Line, Inner Rabbet Line
A common wooden boat design/construction word.