Added 9 October 2026 macromolecule /ˈmækɹəʊˌmɒlɪkjuːl/ noun Categories: NatureRare Words noun ! Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about macromolecule at Wordnik → Where our words come from → A very large molecule, especially used in reference to large biological polymers (e.g. nucleic acids and proteins). Related Words: supermoleculesupermacromoleculebiomacromoleculemacropolymermacroproteinmacroenzymeheteromacromoleculemegaproteinmacroglycopeptidemacrochromatinmacrosome Back to today's word