A word is one or more sounds that in combination have a specific meaning assigned by a language. The symbolic meaning of words can be so powerful that people are willing to risk their lives for them or take the lives of others.
A nerve impulse is the relaying of a coded signal from a nerve cell to an effector (a muscle cell, a gland cell or another nerve cell) in response to a stimulus. It is the means by which a nerve cell communicates with another cell.
Definition of nerve for English Language Learners. : 1  one of the many thin parts that control movement and feeling by carrying messages between the brain and other parts of the body. : 2  courage that allows you to do something that is dangerous, difficult, or frightening.