molecular formula
noun
: a chemical formula that gives the total number of atoms of each element in each molecule of a substance compare structural formula
Example Sentences
Recent Examples on the Web Every finite group has a unique molecular formula of this kind — a collection of simple groups from which it is made. 
Quanta Magazine, 22 Sep. 2017
Quanta Magazine, 22 Sep. 2017 Word History
First Known Use
1861, in the meaning defined above
Medical Definition
molecular formula
noun
: a chemical formula for a compound existing as discrete molecules that gives the total number of atoms of each element in a molecule
the molecular formula for water is H2O
see structural formula compare empirical formula