You know what it looks like… but what is it called?
TAKE THE QUIZ“half-breadth”
We have one entry that includes the term half-breadth.
half-breadth plan
noun: a plan of one side of a ship showing by horizontal longitudinal sections the forms of the various waterlines, rail and deck lines at the side, the frame stations, and the buttock lines
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Merriam-Webster unabridged