(trōl) v.t.
1. To cause to roll; revolve.
2. To sing in succession, as in a round or catch.
3. To sing in a full, hearty manner.
4. To fish for with a moving lure, as from a moving boat.
5. To move (the line or lure) in fishing.
6. Obs. To pass around, as a bottle or decanter.
—v.i.
7. To roll; turn.
8. To sing a tune, etc., in a full, hearty manner.
9. To be uttered in such a way.
10. To fish with a moving lure.
11. Obs. To move about; ramble.
—noun
1. A catch or round.
2. A rolling movement or motion; hence, repetition or routine.
3. In fishing, a spoon or other lure. [? <OF troller quest, wander <Gmc. Cf. MHG trollen walk with short steps.]
—troll′er noun

(trōl) noun
In Scandinavian folklore, a giant; later, a friendly but often mischievous dwarf. Also trold (trōld). [<ON]