Good one, Helen! This will surely test us all... well, except maybe for tsuwm. (Google scratched its little cyber-head when I tried there). I'm guessing it's used in the reviewed book and may have been coined by the author, for the reason Faldage cited or maybe as a Scrabble word under made-up rules.

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vein

Nother good one, Faldage, you old lode of puns & info!