troll

Concise Oxford English Dictionary © 2008 Oxford University Press:
troll1 /trəʊl, trɒl/

▶noun (in folklore) an ugly cave-dwelling being depicted as either a giant or a dwarf.

– origin ME (in the sense ‘witch’): from ON and Swed. troll, Dan. trold.

Concise Oxford English Dictionary © 2008 Oxford University Press:
troll2 /trəʊl, trɒl/

▶verb

• 1 (often troll for) fish by trailing a baited line behind a boat.

  ■ search for something.

• 2 chiefly Brit. stroll.

• 3 sing in a happy and carefree way.

• 4 (usu. as noun trolling) informal send (an email or newsgroup posting) with the intention of provoking an angry response.

▶noun an act of trolling.

■ a line or bait used in trolling for fish.

– derivatives
troller noun.

– origin ME (in the sense ‘stroll, roll’): of uncertain origin; cf. OFr. troller ‘wander in search of game’ and Mid. High Ger. trollen ‘stroll’.