Usually means: Embryonic heart's initial blood collection.
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We found 14 dictionaries that define the word sinus venosus:

General (9 matching dictionaries)
  1. sinus venosus: Merriam-Webster
  2. sinus venosus: Oxford Learner's Dictionaries
  3. sinus venosus: American Heritage Dictionary of the English Language
  4. sinus venosus: Wordnik
  5. sinus venosus: Dictionary.com
  6. Sinus venosus: Wikipedia, the Free Encyclopedia
  7. sinus venosus: FreeDictionary.org
  8. sinus venosus: TheFreeDictionary.com
  9. sinus venosus: Wiktionary

Computing (1 matching dictionary)
  1. sinus venosus: Encyclopedia

Medicine (4 matching dictionaries)
  1. sinus venosus: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. online medical dictionary (No longer online)
  4. sinus venosus: Medical dictionary

Definitions from Wiktionary (sinus venosus)

noun:  (zootomy) The first chamber of the heart in fish, amphibians, and reptiles, emptying into the right atrium.
noun:  (anatomy) An enlarged pouch that adjoins the heart, is formed by the union of the large systemic veins, and is the passage through which venous blood enters the heart in lower vertebrates and in embryos of higher forms.

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