Definition: The word 'adder' has two meanings in English. 1. The adjective "adder" is a generic term used to describe something that is larger than another, as in "the adder's horn." It can also refer to an animal that uses a beak or fork for its food. 2. In medicine, the word 'adder' refers to a substance that acts as an excitatory neurotransmitter in the brain, helping to regulate mood and behavior. Examples include norepinephrine, dopamine, and serotonin, which are all known to be excitatory neurotransmitters in the brain.
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