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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From New Latin, from Ancient Greek roots; by surface analysis, bronto- + -saurus (“thunder lizard”), according to the notion that its massive size must have made its footsteps shake the ground.
apatosaur, apatosaurus, brontosaur, thunder lizard, Apatosaurus excelsus
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Classic usage
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