A winged unicorn. A combonation of a unicorn and a pegasus. Sometimes known as a unipeg.
"The alicorn flew overhead, its horn prominent on its head, shining in the sunlight."
by Rose-Pose January 18, 2006
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The spiral horn of a unicorn.
"If you cut the alicorn, she'll die."
by Ceveri November 12, 2005