\Tic"kler\, n.
1. One who, or that which, tickles.

2. Something puzzling or difficult.

3. A book containing a memorandum of notes and debts arranged
   in the order of their maturity. [Com. Cant, U. S.]
   --Bartlett.

4. A prong used by coopers to extract bungs from casks.
   [Eng.]