Poly cyclic

polycyclic

[pol-ee-sahy-klik, -sik-lik]
adjective Chemistry.
pertaining to an organic compound containing several atomic rings, usually fused.

Origin:
1865–70; poly- + cyclic

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World English Dictionary
polycyclic (ˌpɒlɪˈsaɪklɪk)
 
adj
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
 
n
3.  a polycyclic compound: anthracene is a polycyclic

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American Heritage
Science Dictionary
polycyclic   (pŏl'ĭ-sī'klĭk, -sĭk'lĭk)  Pronunciation Key 
Having two or more atomic rings in a molecule. Steroids are polycyclic compounds.
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