tektosilicate

[tek-toh-sil-i-kit, -keyt]

noun Mineralogy.

any silicate in which each tetrahedral group shares all its oxygen atoms with neighboring groups, the ratio of silicon to oxygen being 1 to 2.

Origin:
< Greek tēktó(s) molten + silicate

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Tektosilicate 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.

the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).

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