Answer:
narc/o
Step-by-step explanation:
The prefix neur/o means string and refers to nerves, neural tissue, and the nervous system. An example is the term neurosurgery, which a procedure on the small peripheral nerves or possibly the brain and spinal column.
The prefix gli/o means glue refers to the glial cells of the nervous system that hold neurons in place. An example is a term glioma which is a brain tumor involving the glial cells.
The prefix esthesi/o means sense and refers to feeling or perception of certain senses. Likely the most common example is the term anesthesia, a medication used to reduce feeling, could be a local anesthesia that makes an area numb or a general anesthesia used to induce sedation.
Lastly, the prefix narc/o means sleep and refers to medications and or conditions involving sleep, rest, or sedation. An example is narcolepsy, a condition in which the patient is excessively drowsy during the day and in some cases cannot control when they fall asleep.