Etymology

latissimus dorsi

Today it means: A large, flat, dorsolateral muscle on the trunk, posterior to the arm, and partly covered by the trapezius on its median dorsal region. Full definition →

Latin lātissimus
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The story

  1. Latin · derived fromlātissimus“widest, broadest”
  2. English todaylatissimus dorsi

From Latin lātissimus (“widest, broadest”) (superlative of lātus (“wide, broad”)) + dorsī (genitive of dorsum (“the back”)).

Etymology from Wiktionary, CC BY-SA 4.0.