I learned "necromancy," among other things, and from it derived "necropolis." I'm still a little unclear on what exactly a "fane" might be, aside from a great place to go adventuring.
"Codex," "libram," "somatic," "sepia" (I remember being surprised when this came up in a school vocabulary exercise some years later - thank you, sepia snake sigil!), a bunch of the alternate names for clerics listed in the 2e PH, "phylactery," "periapt," possibly "petrification," "myrmidon," "arquebus,"... and a whole bunch of medieval occpations, among other things. Then there's all the words I learned from reading Sep's Tales of Wyre (even if "viridity" and "saizhan" are questionable, there's still "metagnostic"). Some of my other geeky hobbies are even worse - "psychopomp" first came from reading Sandman, though I didn't grok its meaning at the time, but it later came up in one of the LARPs I play, so I actually learned it.
Haven
Further Proof that Gaming Is Good For You!