sinus venosus

UK/ˌsʌɪ.nəs viːˈnəʊ.səs/US/ˌsaɪ.nəs ˌviˈnoʊ.səs/

noun

The first chamber of the heart in fish, amphibians, and reptiles, emptying into the right atrium.

OriginNew Latin sinus vēnōsus →
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Meanings

nounsinus venosus (plural sinus venosi)

plural sinus venosi · alternative venous sinus

  1. biologyThe first chamber of the heart in fish, amphibians, and reptiles, emptying into the right atrium.
  2. anatomyAn 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.

Origin

  1. New Latinsinus vēnōsus“venous hollow”
  2. Englishsinus venosus

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

More words from New Latin

Full word history & related roots →

Translations

Chinese Mandarin 靜脈竇 /静脉窦
  • 靜脈竇 /静脉窦 (jìngmài dòu)pouch adjoining the heart
Polish zatoka żylna
  • zatoka żylnapouch adjoining the heart

Rhymes & wordplay

Rhymes with sinus venosus

nebulosusbulbocavernosusbulbospongiosussemimembranosussemitendinosus
All rhymes →
Cite this entry
APA

sinus venosus. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/sinus%20venosus

MLA

“sinus venosus.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/sinus%20venosus. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “sinus venosus,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/sinus%20venosus.

Source: sinus venosus on Wiktionary, CC BY-SA 4.0.