Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

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