cyclopentadiene

[sahy-kluh-pen-tuh-dahy-een, sik-luh-]

cy·clo·pen·ta·di·ene

[sahy-kluh-pen-tuh-dahy-een, sik-luh-]
noun
a colorless liquid, C5H6, derived by the distillation of coal tar: used chiefly in the manufacture of insecticides and resins.

Origin:
cyclo- + penta- + -diene
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Cyclopentadiene has a plethora of syllables.
So is dichlorodiphenyltrichloroethane. Does it mean:
opposition to the withdrawal of state support or recognition from an established church, esp. the Anglican Church in 19th-century England.
a white, crystalline, water-insoluble solid, C14H9Cl5, usually derived from chloral by reaction with chlorobenzene in the presence of fuming sulfuric acid: used as an insecticide and as a scabicide and pediculicide: agricultural use prohibited in the U.S.
Collins
World English Dictionary
cyclopentadiene (ˌsaɪkləʊˌpɛntəˈdaɪiːn)
 
n
a colourless liquid unsaturated cyclic hydrocarbon obtained in the cracking of petroleum hydrocarbons and the distillation of coal tar: used in the manufacture of plastics and insecticides. Formula: C5H6

Collins English Dictionary - Complete & Unabridged 10th Edition
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