The Collaborative International Dictionary of English v.0.48:

Bulkhead \Bulk"head`\, n. [See Bulk part of a building.]
   1. (Naut.) A partition in a vessel, to separate apartments on
      the same deck.
      [1913 Webster]

   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.
      [1913 Webster]

   Bulked line, a line beyond which a wharf must not project;
      -- usually, the harbor line.
      [1913 Webster]