View your list of saved words. (You can log in using Facebook.)
About Our Definitions: All forms of a word (noun, verb, etc.) are now displayed on one page.
Definition of MACROMOLECULE
: a very large molecule (as of a protein or rubber)
Origin of MACROMOLECULE
International Scientific Vocabulary
First Known Use: circa 1929
Medical Definition of MACROMOLECULE
: a very large molecule (as of a protein, nucleic acid, or rubber) built up from smaller chemical structures—compare micromolecule
Any very large molecule, composed of much larger numbers (hundreds or thousands) of atoms than ordinary molecules. Some macromolecules are individual entities that cannot be subdivided without losing their identity (e.g., certain proteins, with molecular weights into the millions). Others (polymers) are multiples of a repeating building block (monomer) in chains or networks (e.g., plastics, cellulose). Most macromolecules are in the size range typical of colloids.