Related Words

Ascending Node: The zodiacal point at which a planet crosses the ecliptic from south to north. Also called the north node.

Lunar Nodes: The points where the plane of the Moon's orbit intersects the ecliptic. The point where the Moon crosses in going from south to north is called the ascending node and the point where the cro . . . View Full Definition

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

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.

Palinode: An ode or song that retracts what the poet wrote in a previous poem: a recantation.

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 ar . . . View Full Definition

Reishi Mushroom (Ganoderma sinensis): An immunostimulant

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.

Simian Immunodeficiency Virus (SIV): A virus that is found, in numerous strains, in primates.

Severe Combined Immunodeficiency (SCID): A genetic disorder in which affiicted individuals have no functional immune system and are prone to infections. Both the cell-mediated immune response and the antibody-mediated response are absent.