from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Chemistry See ring1.
from the GNU version of the Collaborative International Dictionary of English
- n. terms applied to the chemical structure of compounds whose rational formulæ are written respectively in the form of a closed ring (see Benzene nucleus, under Benzene), or in an open extended form.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. (chemistry) a chain of atoms in a molecule that forms a closed loop
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