oa·kum /ˈokəm/
填絮
Oak·um n.
1. The material obtained by untwisting and picking into loose fiber old hemp ropes; -- used for calking the seams of ships, stopping leaks, etc.
2. The coarse portion separated from flax or hemp in nackling.
White oakum, that made from untarred rope.
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oakum
n : loose hemp or jute fiber obtained by unravelling old ropes;
when impregnated with tar it was used to caulk seams and
pack joints in wooden ships