Etymology

tentaculite

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Today it means: Any of numerous species of small, conical shells found in Paleozoic rocks, fossils from the extinct genus †Tentaculites. Full definition →

Latin tentaculum
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The story

  1. Latin · derived fromtentaculum
  2. English todaytentaculite

From the genus name, from Latin tentaculum + -ites.

Etymology from Wiktionary, CC BY-SA 4.0.