(1):

(n.) An artificial tinder. See Amadou, and Spunk.

(2):

(n.) A fungus (Polyporus fomentarius, etc.) sometimes dried for tinder; agaric.

(3):

(n.) A prostitute; a strumpet.

(4):

(n.) Wood so decayed as to be dry, crumbly, and useful for tinder; touchwood.