主しゅ鎖さMeanings1nounmain chain; principal chain; backbone chainchemistry›Chemistry term for the longest continuous chain of atoms in a molecule, especially in organic polymers and nomenclature.ポリマーの主しゅ鎖さは炭たん素そ原げん子しで構こう成せいされている。The main chain of the polymer is composed of carbon atoms.