Source : Webster's Revised Unabridged Dictionary (1913)

Tinder \Tin"der\, n. [OE. tinder, tunder, AS. tynder, tyndre;
   akin to tendan to kindle, D. tonder tinder, G. zunder, OHG.
   zuntara, zuntra, Icel. tundr, Sw. tunder, Dan. t["o]nder. See
   {Tind}.]
   Something very inflammable, used for kindling fire from a
   spark, as scorched linen.

   {German tinder}. Same as {Amadou}.

   {Tinder box}, a box in which tinder is kept.

Source : WordNet®

tinder
     n : material for starting a fire [syn: {kindling}, {touchwood},
         {spunk}, {punk}]