What new words have you learned recently?

[Fyraltari]

Carcinisation (Or Carcinization for the Americans).

From reading it you might think it was related to 'carcinogen', a substance which promotes the growth of cancerous cells.... And you'd only be half right.

"Carcin-" and "cancer" are in this case linked not by chemistry, but by astrology. Carcinisation is a process of convergent evolution (that is, animals evolving independently of each other and not otherwise being genetically related) to eventually come to resemble a crab-like creature.
Apparently it's something that has happened 5 or 6 times throughout history - nature really, really likes crabs and keeps trying to get things to evolve into them from several different sources, so much so that the process has its own name.

That has nothing to do with astrology. "Cancer" is latin for crab. The constellation looks like a crab and the ancient Greek doctors compared tumors to crabs.