Alicorn

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.

Tests to verify the authenticity of alicorn—most of which involved placing spiders near the horn and observing their reactions—were numerous, but apparently few detected bogus horn, for narwhal tusks, masquerading as unicorn horn, made their way into shops across Europe.

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.