In chemistry, containing two rings of atoms fused or joined together; or relating to a bicycle.
From bi- (two) + cyclic (from cycle, Greek kyklos, wheel). In chemistry, emerged as synthetic compounds with complex ring structures became common in the 20th century.
Bicyclic compounds are the foundation of tons of useful medicines and explosives—like morphine or TNT—because two fused rings create a rigid 3D structure that enzymes or reactions can really grab onto and do interesting things with.
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