Sinoatrial (SA) Node

Science / Biology / Sinoatrial (SA) Node: A region of modified muscle cells in the right atrium that sends timed impulses to the hearts other muscle cells, causing them to contract; the hearts pacemaker.


Entertainment / Literature / Palinode: Singing again): A poem, song, or section of a poem or song in which the poet renounces or retracts his words in an earlier work. Usually this is meant to apologize or counterbalance earlier material. MORE


Science / Astrology / Nodes: The two points in a planet's orbit which intercept the Earth's path around the sun (otherwise known as the ecliptic). MORE

Node Of Ranvier

Science / Biology / Node Of Ranvier: A gap between two of the Schwann cells that make up an axons myelin sheath; serves as a point for generating a nerve impulse. MORE

Node Factor (F)

Science / Tides and Currents / Node Factor (F): A factor depending upon the longitude of the Moon's node which, when applied to the mean coefficient of a tidal constituent, will adapt the same to a particular year for which predictions are to be ma MORE

Planetary Node

Science / Astrology / Planetary Node: The point at which a planet's path intersects the ecliptic; declination, 0°. The term is usually reserved for nodes other than the Moon's Nodes. MORE

Reishi Mushroom (Ganoderma sinensis)

Health / Herbs / Reishi Mushroom (Ganoderma sinensis): An immunostimulant MORE