Meaning & use

subscript

noun·Academic

A small number written below and after a chemical symbol to show how many atoms of that element are present.

See it in a sentence

In H2O, the subscript 2 shows that each water molecule has two hydrogen atoms.

Chemists use a subscript to indicate the number of atoms in a molecular formula.

A note on using this word

Do not confuse a chemical subscript, which counts atoms, with a superscript, which shows an ion's electric charge.

Words with a similar meaning

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Words with an opposite meaning

superscript

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