tickler
n
1 Informal (chiefly Brit) a difficult or delicate problem
2 (Also called)
tickler file (U.S.) a memorandum book or file
3 (Accounting) (U.S.) a single-entry business journal
4 a person or thing that tickles
rib-tickler
n a very amusing joke or story
♦
rib-tickling adj
tickler coil
n a small inductance coil connected in series in the anode circuit of a valve and magnetically coupled to a coil in the grid circuit to provide feedback