Which combining form is used to denote starch?

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

Answer: (C)

Amyl/o denotes starch in medical terminology. This combining form comes from the Greek word amylon, meaning starch, and it appears in terms like amylase, the enzyme that digests starch, and amylose, a component of starch. The other options refer to milk (lact/o), smooth (lei/o, as in smooth muscle), or tail (caud/o), so they do not indicate starch. Therefore, amyl/o is the correct combining form.