Final answer:
The root word meaning 'liver' is 'hepat-'. It is commonly used in medical terminology to refer to liver-related terms, such as hepatitis and hepatology.
Step-by-step explanation:
The root word that means 'liver' is hepat-. This prefix is derived from the Greek word 'hepar', meaning liver, and it is commonly used in medical terminology to refer to the liver. For example, hepatitis is an inflammation of the liver, and hepatology is the branch of medicine that studies the liver, its functions, and its disorders. Other root words you listed such as 'nephr-' refer to the kidney and 'path-' refers to disease. 'Morph-' typically refers to form or structure.