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English Lexicon

Obsidian

/əbˈsɪd.i.ən/
nounCEFR C1 (Advanced)Top #14250 frequency
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Comprehensive Definitions & Senses

1 sense
As noun
  1. 1

    A dark, glasslike volcanic rock that forms when lava cools rapidly without crystal growth.

    "Ancient peoples used sharp flakes of obsidian to craft arrowheads and blades."
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Synonyms (1)

Linguistic Origin & Historical Etymology

Derived from the Latin word 'obsidianus', a misspelling of 'obsianus', referring to a stone discovered in Ethiopia by a Roman explorer named Obsius. The term was adopted into English in the late 18th century to describe naturally occurring volcanic glass.

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