http://en.wikipedia.org/wiki/Runcible
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runcible, adj.
A nonsense word originally used by Edward Lear in runcible cat, runcible hat, etc. Recorded earliest in runcible spoon, in The Owl and the Pussycat. 

There's this 'bout the vocabulary
Gives runcibility to the runcibulary --
I runce that which's enuncible,
And, why, it now is runcible!


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See also monorhyme, genethliacon.