Meaning: the process by which snow becomes a glacier; firn is old snow. It's from a German word meaning 'of last year', which has the rare honour of being described as a 'useful word' by the Online Etymology Dictionary.
Usefulness: 1 (Used symbolically - unless you happen to live on a mountain top - this is a ridiculously useful word for all those things you haven't done for far too long. "The only way to overcome the firnification of my ironing basket was to throw it out." "The firnification of the editor's slush pile was complete: later generations would be able to chart publishing trends by measuring the layers of boy wizard, vampire and erotic fiction.")
Logofascination: 1 (there is something about words for very specific things, and f-words - fuliginous is quite popular, for some reason)
Usefulness: 1 (Used symbolically - unless you happen to live on a mountain top - this is a ridiculously useful word for all those things you haven't done for far too long. "The only way to overcome the firnification of my ironing basket was to throw it out." "The firnification of the editor's slush pile was complete: later generations would be able to chart publishing trends by measuring the layers of boy wizard, vampire and erotic fiction.")
Logofascination: 1 (there is something about words for very specific things, and f-words - fuliginous is quite popular, for some reason)