Etymology

sinus venosus

Today it means: The first chamber of the heart in fish, amphibians, and reptiles, emptying into the right atrium. Full definition →

New Latin sinus vēnōsus
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The story

  1. New Latin · borrowed fromsinus vēnōsus“venous hollow”
  2. English todaysinus venosus

Unadapted borrowing from New Latin sinus vēnōsus (“venous hollow”).

Etymology from Wiktionary, CC BY-SA 4.0.