My question is about the applications of the term "alicorn." What I know is that it's a medieval term used for supposed compounds of unicorn horn. Later Peers Anthony used the term for a horned pegasus/winged unicorn in his books in the 80's. In this century, the My Little Pony franchise adopted that definition too.
I'm clearly missing something, however. If you plug "alicorn" into google ngram, you'll see a massive spike from 1925 to 1934, that dwarfs any of the later uses. What was going on then? Why the sudden jump, and then the equally sudden drop?