coordination compound

from The American Heritage® Dictionary of the English Language, 4th Edition

• n. A chemical compound formed by joining independent molecules or ions usually to a central metallic atom by coordinate bonds. Also called coordination complex.

from Wiktionary, Creative Commons Attribution/Share-Alike License

• n. 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.

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