noun
firelighter; fire starter
A solid or gel substance used to help ignite charcoal, wood, or campfires. Common in outdoor and barbecue contexts.
バーベキューをするときは、着火剤を使うと炭に火がつきやすい。
When having a barbecue, using a firelighter makes it easier to light the charcoal.
Compound of 着火 (ignition) + 剤 (agent/chemical). The alternate form 着火材 uses 材 (material).