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elementary

 
/ˌel·əˈmen·tri/, /-ˈmen·tə·ri/ adj [not gradable] (OF CHEMICAL SUBSTANCE)

Definition

chemistry, physics relating to the chemical elements: The elementary charge (= the electrical charge in the nuclear material of an element) is one of the constants that characterizes the basic particles of matter.
(Definition of elementary adj (OF CHEMICAL SUBSTANCE) from the Cambridge Academic Content Dictionary © Cambridge University Press)

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