open chain

Pronunciation:			'owpun cheyn
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WordNet Dictionary
	Definition:		[n]  a chain of atoms in a molecule whose ends are not joined to form a ring [adj]  chemistry; not cyclic; having an open chain structure
	Synonyms:		acyclic, aliphatic
	Antonyms:		closed chain, cyclic, ring
	See Also:		branched chain, chain, chemical chain, straight chain