Definitions

1. noun

A trunk, especially one that has been cut or felled.

“The logger carefully cut down the tree, leaving a large truncus at the base.”

2. noun

A main stem or trunk of an animal, especially a vertebrate.

“The truncus of the snake was thick and scaly.”

3. noun

A main artery or blood vessel, especially one that arises from the heart.

“The truncus arteriosus is a critical part of the embryonic heart.”