Hevelian halo

 [huh-vey-lee-uhn]  

He·ve·li·an ha·lo

   [huh-vey-lee-uhn]
noun
a faint white halo with an angular radius of 90° that is occasionally seen around the sun or the moon, thought to be caused by the reflection and refraction of sunlight by ice crystals.
Origin:
after J. Hevelius; see -ian
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Hevelian halo has a plethora of syllables.
So is pneumonoultramicroscopicsilicovolcanoconiosis. Does it mean:
an obscure term ostensibly referring to a lung disease caused by silica dust, sometimes cited as one of the longest words in the English language.
(used as a nonsense word by children to express approval or to represent the longest word in English.)
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