Final answer:
The CF atri/o means the chamber of the heart that receives blood from the veins.
Step-by-step explanation:
The CF atri/o refers to the chamber of the heart that receives blood from the veins. In medical terminology, combining forms such as atri/o are used to form words related to specific organs or structures. In this case, atri/o is used to describe the atrium, which is a chamber of the heart.