portal system

noun

Definition of portal system 

: a system of veins that begins and ends in capillaries

First Known Use of portal system

1754, in the meaning defined above

History and Etymology for portal system

portal vein

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The first known use of portal system was in 1754

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portal system

noun

Medical Definition of portal system 

: a system of veins that begins and ends in capillaries — see hepatic portal system, pituitary portal system

More from Merriam-Webster on portal system

Britannica.com: Encyclopedia article about portal system

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