noun
lighter fluid; lighter gel
A commercial product name for a flammable liquid or gel used to ignite charcoal or firewood. Often seen in outdoor or barbecue contexts.
バーベキューをする前に、炭に着火燃をかけてください。
Before barbecuing, please apply lighter fluid to the charcoal.
着火剤 is a general term for fire-starting agents, while 着火燃 is a specific brand name for lighter fluid/gel.
A coined product name combining 着火 (ignition) and 燃 (burn). The exact derivation is uncertain; it is a commercial term.