1. a highly flammable material or preparation formerly used for catching the spark from a flint and steel struck together for fire or light.
2. any dry substance that readily takes fire from a spark.
Other examples:
Lighting the tinder and wood, the camper prepared for an overnight stay at the campground. As he walked through the woods, the boy always kept an eye out for tinder to collect for a fire. After the tinder is burning well, add small kindling.