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plural macromolecules
(chemistry, biochemistry) A very large molecule, especially used in reference to large biological polymers (e.g. nucleic acids and proteins). quotations examples
Beadle discovered that genes carried instructions to build proteins—complex, multidimensional macromolecules that were the workhorses of the cell.
2010, Siddhartha Mukherjee, The Emperor of All Maladies, Fourth Estate (2011), page 345