Definition of German tinder in US English:

German tinder

noun

historical
  • 1A felt-like material prepared from the fruiting bodies of Fomes fomentarius and certain other fungi, used especially as tinder (usually after having been soaked in saltpetre); = "amadou". Now historical.

  • 2More fully "German tinder fungus". The bracket fungus Fomes fomentarius; compare "tinder-fungus". Now rare.

Origin

Late 18th century. From German + tinder.

Pronunciation

German tinder

/ˈdʒəːmən ˈtɪndə/