Hapax legomenon: A word or phrase for which there is only one recorded usage. A unique phenomenon.

And, wwh, hapax all by its lonesome also apparently means a word only used once.

See:

http://phrontistery.50megs.com/h.html

Dear WW: I can't say it again. It is forbidden, I know not how.

wwh:

Hapax and hamate are both on the link I posted above. Coincidence? I don't think so!!!

Think we can pursue this "h" thing and come up with a few lottery winners?

Best results,
Wordwind

For JazzO: Did you know that the Romans in Britain had a heating system found by archaeologists, far superior to anything in Britain until comparatively recently. They had "hypocausts" ducted heat beneath tile floors. I read it in Scientific American so long ago I forget whether it was hot air or hot water. Shame the idea got lost.