Wordnet 3.0
NOUN (1)
1. 
 a weapon that squirts ignited fuel for several yards; 
The Collaborative International Dictionary of English v.0.48:
flamethrower \flamethrower\ n. (Mil.)
   a weapon that squirts ignited liquid or gelatinous fuel for
   several yards.
   [WordNet 1.5]
WordNet (r) 3.0 (2006):
flamethrower
    n 1: a weapon that squirts ignited fuel for several yards
Moby Thesaurus II by Grady Ward, 1.0:
21 Moby Thesaurus words for "flamethrower":
   automatic, blowgun, blowpipe, firearm, gat, gun, handgun, heater,
   musket, peashooter, piece, pistol, repeater, revolver, rifle, rod,
   sawed-off shotgun, shooting iron, shotgun, six-gun, six-shooter