The crossword solution for the term 'Trunk with no bark' is AORTA. AORTA is the largest artery in the human body, originating from the left ventricle of the heart and extending down to the abdomen, where it splits into two smaller arteries. It is responsible for carrying oxygen-rich blood from the heart to the rest of the body. The term 'trunk with no bark' is a reference to the fact that the AORTA has no external covering, unlike other arteries.