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Children's Dictionary
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anxiety a feeling of being worried, nervous, or afraid that something will happen.
anxious feeling worried, nervous, or afraid about something uncertain. [1/2 definitions]
brain the organ inside the skull of humans and animals. The brain is the main part of the central nervous system. It controls the body's movements and activities and is the center of thought, memory, and feelings. [1/3 definitions]
caffeine a bitter substance found in coffee, tea, chocolate, and some sodas. Caffeine stimulates the heart and nervous system and can cause a person to stay awake and alert.
disturb to make nervous or uneasy; to trouble. [1/3 definitions]
edgy nervous or impatient; on edge.
epilepsy a nervous system disorder that causes convulsions and unconsciousness.
fiddle to move the fingers or hands without purpose or in a nervous way to fix or adjust something. [1/4 definitions]
fidget to move in a nervous or restless way. [1/2 definitions]
fluster to cause to become nervous, confused, or upset. [2 definitions]
fumble to search or feel about for something in a nervous or clumsy way. [1/4 definitions]
giggle to laugh in a silly or nervous way. [2 definitions]
high-strung very nervous; easily upset; usually tense.
on edge nervous or anxious; full of worry.
pain physical hurt or discomfort that is usually caused by injury or illness. Pain is the nervous system's way of telling the brain that something is wrong. [1/5 definitions]
paralysis a loss of feeling in or the ability to move a body part. Paralysis is caused by injury or disease of the nervous system.
polio a short form of poliomyelitis, a disease caused by a virus that attacks the spinal cord and damages the nervous system. Poliomyelitis affects mainly children and can lead to paralysis or deformed limbs.
poliomyelitis a disease caused by a virus that attacks the spinal cord and damages the nervous system. Poliomyelitis affects mainly children and can lead to paralysis or deformed limbs. Jonas Salk invented a vaccine that prevents poliomyelitis.
reflex a response or reaction of the body that is not chosen or controlled by conscious thought. A reflex occurs when the nervous system reacts to a stimulus. [1/3 definitions]
spook (informal) to frighten or cause to be nervous. [1/2 definitions]
uneasy not comfortable; nervous. [1/2 definitions]