1. closed chain - Noun
2. closed chain - Adjective Satellite
(chemistry) a chain of atoms in a molecule that forms a closed loop
having atoms linked by bonds represented in circular or triangular form
Source: WordNetclosed-chain
In these closed-chain forms, the aldehyde or ketone group remains non-free, so many of the reactions typical of these groups cannot occur. Source: Internet
For many monosaccharides (including glucose), the cyclic forms predominate, in the solid state and in solutions, and therefore the same name commonly is used for the open- and closed-chain isomers. Source: Internet