locant

noun
lo·cant | \ ˈlōkənt \
plural -s

Definition of locant 

: the portion of a chemical name that designates the position of an atom or group in a molecule (as β- in β-naphthylamine, m- in m-xylene, 2- in 2-butanol, or 1- in glucose-1-C14)

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History and Etymology for locant

location + -ant

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to deposit or conceal in a hiding place

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