ligan

from WordNet (r) 3.0 (2006)

ligan
    n 1: goods (or wreckage) on the sea bed that is attached to a
         buoy so that it can be recovered [syn: {lagan}, {lagend},
         {ligan}]

from The Collaborative International Dictionary of English v.0.48

Ligan \Li"gan\ (l[imac]"gan), n. [Cf. L. ligare to bind, to tie,
   ligamen band, bandage, E. ligament, or ligsam.] (Law)
   Goods sunk in the sea, with a buoy attached in order that
   they may be found again. See {Jetsam} and {Flotsam}. [Written
   also {lagan}.] --Blackstone.
   [1913 Webster]

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

LIGAN or LAGAN. Goods cast into the sea tied to a buoy, so that they may be 
found again by the owners, are so denominated. When goods are cast into the 
sea in storms or shipwrecks, and remain there without coming to land, they 
are distinguished by the barbarous names of jetsam, (q.v.) flotsam, (q.v.) 
and ligan. 5 Rep. 108; Harg. Tr. 48; 1 Bl. Com. 292.

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