pyramidion

 [pir-uh-mid-ee-uhn, -on]  

pyr·a·mid·i·on

   [pir-uh-mid-ee-uhn, -on]
noun, plural pyr·a·mid·i·a  [-mid-ee-uh] .
a miniature pyramid, as at the apex of an obelisk.
Origin:
1830–40; < Neo-Latin, equivalent to pȳramid- pyramid + -ion diminutive suffix < Greek
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Pyramidion has a plethora of syllables.
So is dichlorodiphenyltrichloroethane. Does it mean:
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.
a white, crystalline, water-insoluble, powerful high explosive, C3H6N6O6, used chiefly in bombs and shells.
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