open chain

noun Chemistry.

a series of atoms linked in a chain not joined together at its ends, and so represented in its structural formula.

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Origin:
1880–85

Related forms

o·pen-chain, adjective

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Open chain is always a great word to know.

So is scrub. Does it mean:

to remove impurities from a gas by chemical means, as sulfur dioxide from smokestack gas or carbon dioxide from exhaled air in life-support packs

a substance that, because of the reactions it causes, is used in analysis and synthesis

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Collins

World English Dictionary

open chain

—n
	a chain of atoms in a molecule that is not joined at its ends into the form of a ring

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

open chain
An arrangement of atoms of the same type that does not form a ring. Aliphatic compounds, such as ethane and isopropyl alcohol, are open-chain compounds.

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"In the depths of every heart, there is a tomb and a dungeon, though the lights, the music, and revelry above may cause us to forget their existence, and the buried ones, or prisoners whom they hide. But sometimes, and oftenest at midnight, those dark receptacles are flung wide open. In an hour like this, when the mind has a passive sensibility, but no active strength; when the imagination is a mirror, imparting vividness to all ideas, without the power of selecting or controlling them; then pray that your griefs may slumber, and the brotherhood of remorse not break their chain."

-Nathaniel Hawthorne