half-breadth plan

[ haf-bredth, -bretth, -breth, hahf- ]
/ ˈhæfˈbrɛdθ, -ˈbrɛtθ, -ˈbrɛθ, ˈhɑf- /

noun Naval Architecture.

a diagrammatic plan of one half of the hull of a vessel divided lengthwise amidships, showing water lines, stations, diagonals, and bow and buttock lines.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019