Alicorns

Alicorn is a term commonly used within the fandom to describe winged unicorns like Princess Celestia and Princess Luna. The itself does not use the term, referring to the princesses only as "unicorns". It likely arose from a combination of English all and the second half of unicorn, making it a (linguistically controversial) hybrid compound.

Outside the fandom, the term usually denotes the material a unicorn's horn is made out of.