Historical Dictionary of Science Fiction
A fascinating crowdsourced project. You can read the backstory in this article in Wired magazine.
Link tags: neologisms
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The dictionary of obscure sorrows
Ennuitastic.
New Programming Jargon — Global Nerdy
Some of the best neologisms in programming, many of them to do with bug-fixing.
Addictionary :: What's your word?
It's The Meaning Of Liff all over again. Creating and rating neologisms.