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.

(used as a nonsense word by children to express approval or to represent the longest word in English.)

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Collins

World English Dictionary

buckminsterfullerene (ˌbʌkmɪnstəˈfʊləˌriːn)

—n
	a form of carbon that contains molecules having 60 carbon atoms arranged at the vertices of a polyhedron with hexagonal and pentagonal faces. It is produced in carbon arcs and occurs naturally in small amounts in certain minerals

[C20: named after Buckminster Fuller]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage

Science Dictionary

buckminsterfullerene

(bŭk'mĭn-stər-f

l'ə-rēn') Pronunciation Key
An extremely stable, ball-shaped carbon molecule whose structure looks like a geodesic dome. It is believed to occur naturally in soot, and was the first fullerene to be discovered. Also called buckyball. Chemical formula: C₆₀.

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buckminsterfullerene

buck·min·ster·ful·ler·ene