Polycyclic group, in mathematics, a solvable group that satisfies the maximal condition on subgroups
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Polycyclic compound, in organic chemistry, a cyclic compound with more than one hydrocarbon loop or ring structures
Heathcock is known for tackling the chemical synthesis of complex, polycyclic natural products, often possessing unusual biological activity including Daphniphyllum alkaloids, altohyrtin, zaragozic acid, spongistatins, and many others.
Cryptand, a family of synthetic bi- and polycyclic multidentate ligands for a variety of cations
Anatoly Maltsev proved that solvable subgroups of the integer general linear group are polycyclic; and later Louis Auslander (1967) and Swan proved the converse, that any polycyclic group is up to isomorphism a group of integer matrices.