Which combining form means 'tail'?

• A. Amyl/o
• B. Caud/o
• C. Lei/o
• D. Lact/o

Answer: (B)

Tail is expressed in medical terminology by the combining form caud/o, from Latin cauda meaning tail. It’s used in words like caudal, meaning toward the tail or posterior in anatomy. The other options correspond to different concepts: amyl/o means starch, lact/o means milk, and lei/o relates to smooth (as in smooth muscle terms). So caud/o is the combining form that means tail.