(anatomy) Synonym of sinoatrial node.

plural of SA node

(anatomy) Abbreviation of sinoatrial node.

(medicine) a small structure in the heart, located in the Koch's triangle, near the coronary sinus on the interatrial septum

plural of AV node

(astronomy) The point in an orbit at which a body passes the ecliptic plane going north.

plural of ascending node

(astronomy) The point in an orbit at which a body passes the ecliptic plane going south.

plural of descending node

plural of tidal node