The Collaborative International Dictionary of English v.0.48:

Transhipment \Tran*ship"ment\, n.
   Same as Transshipment.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Transshipment \Trans*ship"ment\, n.
   The act of transshipping, or transferring, as goods, from one
   ship or conveyance to another. [Written also transhipment.]
   [1913 Webster]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

TRANSHIPMENT, mar. law. The act of taking the cargo out of one ship and
loading it in another.
     2. When this is done from necessity, it does not affect the liability
of an insurer on the goods. 1 Marsh. Ins. 166; Abbott on Ship. 240. But when
the master tranships goods without necessity, he is answerable for the loss
of them by capture by public enemies. 1 Gallis. R. 443.