Hypertext Webster Gateway: "bulkhead"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Bulkhead \Bulk"head`\, n. [See {Bulk} part of a building.]
1. (Naut.) A partition in a vessel, to separate apartments on
the same deck.
2. A structure of wood or stone, to resist the pressure of
earth or water; a partition wall or structure, as in a
mine; the limiting wall along a water front.
{Bulked line}, a line beyond which a wharf must not project;
-- usually, the harbor line.
From WordNet (r) 1.7 (wn)
bulkhead
n : a partition that divides a ship or plane into compartments
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