What is the meaning of the root esthes/o?

• A. Set or group
• B. Sensation
• C. Urine
• D. Head

Answer: (B)

Esthes/o denotes sensation or perception—the feeling or sense of something through the senses. That’s why it shows up in terms like anesthesia (loss of sensation) or hyperesthesia (increased sensitivity), describing how we perceive or don’t perceive stimuli. This root isn’t about a body part or a substance—head would be cephal/o and urine would be urin/o—so sensation is the precise meaning here.