What does circumferential burn mean?

It is a burn that goes all the way around a body part. For example, it is a burn that is fully around a finger, around a leg, etc., instead of only on one side or one spot on the limb or digit. It is used to describe burns in a medical record and for use in determining the extent of a burn in the medical coding for billing in the treatment of burn patients.

Circumferential comes from circumference - a Word meaning "around something".