alicorn

noun

1. (archaic, countable, uncountable)A unicorn.
2. (countable, historical, uncountable)The horn of a unicorn considered as a medical or pharmacological ingredient.

   “He admits that powdered alicorn will delay the death of a poisoned pigeon, but says that any other horn will do the same thing by retarding assimilation.”

   “"This happens to be my last voyage. But even so, I intend no coercion. If he does not value the alicorn to the extent of ten thousand Spanish dollars, I'll keep it myself. I'm rather fond of the thing. You see, it's a genuine unicorn's horn, and they're exceedingly few."”

   “Two kinds were on the market: Unicornum Verum (Alicorn), thought to be Mammoth Tusk, and Unicornum Falsum, Narwhal tusks.”

   “What a fabulous beast was the mythical unicorn — with its horse's head and hoofs, and a single horn, the alicorn, growing out of its forehead.”

   “The horn of the male narwhal, which sailors called the unicorn of the sea, is thought to have been the unicorn's horn, or alicorn, of medieval commerce. It was very widely believed that alicorn could be used to detect poisons, and when ground and added to a potion would prevent poisoning.”

3. (proscribed)A mythological creature, a mixture of pegasus and unicorn: a winged horse with a single horn on its head.

   “The Alicorn. He be a winged unicorn, the finest equine flesh extant, the adoration of every fair and innocent maiden. For that steed I would give anything.”

   “A silver portal opens in the sky and a^([sic]) ebony alicorn stallion gallops from it the silver tips on his black wings shine in the sun's light.”

   “Rarity: Why, you've become an alicorn! I didn't even know that was possible. Pinkie Pie: [wearing a costume horn and wings] Alicorn party!”