coordination compound

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A chemical compound containing a complex ion.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun chemistry a class of compounds in which a central metal atom (normally a transition element) is surrounded by a group of ions or molecules (ligands)

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a compound described in terms of the central atom to which other atoms are bound or coordinated