noun, Chemistry.
an open chain of atoms attached to an atom of a larger chain, or to a ring.
(chem) a group of atoms bound to an atom, usually a carbon, that forms part of a larger chain or ring in a molecule

side chain n.
A linear group of atoms linked to a benzene ring or to any cyclic chain compound.
side chain
A chain or ring in an organic molecule that branches off from a central structure or from a part that is a point of reference.


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