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plural garboards
(nautical) The board on a boat which attaches to the keel running fore and aft along the bottom. quotations examples
The garboard strakes are generally of American elm, and it is best that the planking above should be of American elm or oak to within a foot or so of the load water-line, and teak above to the covering board or deck edge.
1884, Dixon Kemp, A Manual of Yacht and Boat Sailing (Fourth Edition), page 14