Dictionary

sinus node

noun

Definition of SINUS NODE

:  a small mass of tissue that is embedded in the musculature of the right atrium of higher vertebrates and that originates the impulses stimulating the heartbeat

First Known Use of SINUS NODE

1937

sinus node

noun    (Medical Dictionary)

Medical Definition of SINUS NODE

Browse

Next Word in the Dictionary: sinusoidPrevious Word in the Dictionary: sinusitisAll Words Near: sinus node
March 31, 2015
refluent Hear it
Flowing back
Take a 3-minute break and test your skills!
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears