In chemistry, describing a ring structure where all atoms are part of the main ring, rather than branching off as side groups.
From 'endo-' + 'cyclic' (Greek 'kyklos'), used in organic chemistry since the 19th century.
In chemistry, 'endocyclic' bonds are the backbone of ring structures—they're what make benzene and other aromatic molecules so stable and special, which is why they appear everywhere from plastics to medicines.
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