Source : Webster's Revised Unabridged Dictionary (1913)

Trunnel \Trun"nel\, n.
   A trundle. [R.]

Trunnel \Trun"nel\, n. (Shipbuilding)
   See {Treenail}.

Source : WordNet®

trunnel
     n : a wooden peg that is used to fasten timbers in shipbuilding;
         water causes the peg to swell and hold the timbers fast
         [syn: {treenail}, {trenail}]