|1.||(of a molecule or compound) containing or having molecules that contain two or more closed rings of atoms|
|2.||biology having two or more rings or whorls: polycyclic shells; a polycyclic stele|
|3.||a polycyclic compound: anthracene is a polycyclic|
|polycyclic (pŏl'ĭ-sī'klĭk, -sĭk'lĭk) Pronunciation Key
Having two or more atomic rings in a molecule. Steroids are polycyclic compounds.