| NOUN | object | open chain | a chain of atoms in a molecule whose ends are not joined to form a ring |
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| Meaning | A chain of atoms in a molecule whose ends are not joined to form a ring. | |
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| Narrower | branched chain | An open chain of atoms with one or more side chains attached to it |
| straight chain | An open chain of atoms with no side chains | |
| Broader | chain, chemical chain | (chemistry) a series of linked atoms (generally in an organic molecule) |
| Opposite | closed chain, ring | (chemistry) a chain of atoms in a molecule that forms a closed loop |
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