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n. Any of a class of organic compounds containing a acetylene (-C≡C-) repeat units, especially any that occur naturally in some composite plants.

n. A black polymer, derived from acetylene, containing alternating single and double bonds in a (-CH=CH-) repeat unit; it is an organic semiconductor.

"The soliton in polyacetylene was born with the observation of an electron spin resonance (esr) signal in the pure material where there should not have been one."

polyyne   

acetylene