Directly from Latin:
* Avian: Relating to birds.
* Aviary: A place where birds are kept.
English words with the root "avi":
* Aviation: The art, science, and practice of flight.
* Aviator: A person who flies aircraft.
* Aviculture: The practice of breeding and raising birds.
* Avifauna: The birds of a particular region or period.
* Avian influenza: A highly contagious viral disease affecting birds.
Let me know if you'd like to explore other root words!