polycyclic

[pol-ee-sahy-klik, -sik-lik]

pol·y·cy·clic

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

Origin:
1865–70; poly- + cyclic
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Polycyclic is always a great word to know.
So is alkaline. Does it mean:
like or containing an alkali, which neutralize acids to form salts and turn red litmus paper blue, or having a pH value greater than 7
a mixture composed of different substances or the same substance in different phases, such as solid ice and liquid water
Collins
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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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