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Timber be, according to L&M Large Glossary : Wood for the frame of a ship( as distinct from planks , cabins, gun platforms, etc.)
Planks: sawn wood 2 - 8 inches thick but at least 11 inches in width(cf. Deals), used for the outer skin and decks , mostly of Baltic or English oak, sometimes elm, beech or fir.
wood be also for Planks for cooperage for pipe cask [Pipestaves]
ME for structure wooden;
standing trees ;lumber
timber : (shipbuilding) a wooden rib.
Another term: lands (shipbuilding) framing members running fore and aft and scarf into ribs.