The Collaborative International Dictionary of English v.0.48:

Molotov cocktail \Molotov cocktail\ n.
   A home-made incendiary device consisting of a bottle filled
   with gasoline, and a cloth wick. The wick is lighted, and the
   bottle thrown at a target, such as a vehicle, where it may
   shatter and spread intense flames over the vehicle,
   destroying or damaging it.
   [PJC]

WordNet (r) 3.0 (2006):

Molotov cocktail
    n 1: a crude incendiary bomb made of a bottle filled with
         flammable liquid and fitted with a rag wick [syn: Molotov
         cocktail, petrol bomb, gasoline bomb]