TOUCHWOOD

touchwood. Touchwood, n. rotten wood that soon takes fire

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Touch″wood′ (?), n. [[Probably for tachwood; OE. tache tinder (of uncertain origin) + wood.]] 1. 1. Wood so decayed as to serve for tinder; spunk, or punk.
2. 2. Dried fungi used as tinder; especially, the Polyporus igniarius.