The liver, or a liver-colored substance; used in anatomy and historical medical terminology.
From Greek 'hepar' meaning liver, which appears in many anatomical terms. The word has been used in medical Latin for centuries as the root for liver-related terminology.
The liver is sometimes called nature's chemical factory—it performs over 500 functions!—so it makes sense that ancient Greek physicians gave it its own special name that echoes through modern medicine.
Complete word intelligence in one call. Free tier — 50 lookups/day.