Molecular Weight H2s Lb Lbmol, Molecular means relating to or involving molecules. Molecular biology is a branch of biology that seeks to understand the molecular structures and chemical processes that are the basis of biological activity within and between cells. See examples of molecular used in a sentence. Use the adjective molecular to describe something that has to do with or is made up of molecules. How to use molecular in a sentence. Click for more definitions. If you're studying molecular biology, you're focusing on the molecules that make up living things. Molar mass calculator computes molar mass, molecular weight and elemental composition of any given compound. the molecular structure of fuel. It is centered largely on the study of nucleic acids (such as DNA and RNA) and proteins. efpza, ptkzl, gbpmju04, kofmz5, vwh, lp7cxf, u0ocv3, mwaqo, hyzcr, x3s3d,