What does scler mean?

• A. Red
• B. Flesh
• C. Tube
• D. Hard

Answer: (D)

scler- is a combining form from Greek meaning hard. In medical language it signals hardening or firmness of tissue, which is why you see it in terms like scleroderma (hardening of the skin) or sclerosis (the condition of becoming hard or stiff). So the word part scler- maps to the idea of hardness, making “Hard” the best answer. The other options correspond to different roots (red, flesh, tube) and don’t convey that sense of hardness. The root behind the eye, sclera, even reflects the same idea of a hard, tough outer layer.