Etymology

perlite

P3E1R1L1I1T1E1

Today it means: An amorphous volcanic glass formed by the hydration of obsidian. Full definition →

French perle
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The story

  1. French · derived fromperle“pearl”
  2. English todayperlite

From French perle (“pearl”) + -ite.

Etymology from Wiktionary, CC BY-SA 4.0.