Pertaining to, connected with, produced by, or consisting of, molecules; as, molecular forces; molecular groups of atoms, etc.
Molecular substances are composed of discrete molecules. An exact molecular formula can be written for such substances since each molecule must be composed of the same number and type of atoms (for example, water is H20). Network solids can not have an exact molecular formula since an undefined number of atoms are involved in each structure.
Relating to or produced by or consisting of molecules; "molecular structure"; "molecular oxygen"; "molecular weight is the sum of all the atoms in a molecule".