Tridecimal
A number system having thirteen as its base, in which six times nine equals forty-two, and in which no one writes jokes.
Tridecimal by Anonymous September 12, 2003
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tridecalogism
A thirteen-letter word that means 'thirteen letter word', from Scott Westerfeld's "The Secret Hour".
"Deliciousness", "overzealously", "fossilization" and "hypochondriac" are all tridecalogisms.
tridecalogism by Lindsey Suzanne March 18, 2006
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