anode ânod (#) Fr.: anode An → electrode from which a stream of → electrons leaves, as in an electron tube or electrolytic cell. → cathode. From Gk. anodos "way up," from → ana- "up" + hodos "way." Ânod, loanword from anode as above. |
antinode pâdgereh (#), šekam (#) Fr.: anti-nœud The position of maximum → amplitude midway between two adjacent → nodes in a → standing wave. |
ascending node gereh-e farâzeši Fr.: nœud ascendant The point in an orbit where the orbiting body crosses a reference plane, such as the ecliptic or the celestial equator, going from south to north. The celestial longitude of the ascending node is one of the elements of the orbit. → descending node. |
descending node gereh-e forudeši Fr.: nœud descendant The point in an → orbit where the orbiting body crosses a reference plane, such as the → ecliptic or the → celestial equator, going from north to south. → ascending node. |
dynode dinod (#) Fr.: dynode An electrode that performs electron multiplication by means of secondary emission. From dyn(a)- a combining form meaning "power," → dynamics + -ode a combining form meaning "way, road," used in the formation of compound words (anode; electrode), from Gk. hodos "way." As above. |
line of nodes xatt-e gerehhâ (#) Fr.: lignes des nœuds The line created by the intersection of the equatorial plane and the orbital plane. |
longitude of ascending node derežnâ-ye gereh-e farâzeši Fr.: longitude du nœud ascendant One of the → orbital elements used to specify the orbit of an object in space. It is the angle from the reference direction, called the origin of longitude, to the direction of the → ascending node, measured in the reference plane. → longitude; → ascending node. |
lunar node gereh (#), gowzahr (#) Fr.: nœud One of the two points of intersection of the orbit of the Moon with the plane of → ecliptic. Indeed, the lunar orbit is tilted by about 5 degrees relative to the ecliptic. The revolution period of a lunar node in ecliptic is 18.61 years. Due to perturbation by the Sun, the lunar nodes slowly regress westward by 19.3° per year. See also → ascending node; → descending node. Gereh, → node; gowzahri, related to gowzahr, → draconic month. |
lunar orbit node gereh-e madâri-ye mâh Fr.: nœud de l'orbite lunaire Same as → lunar node. |
node gereh (#) Fr.: nœud 1) A point of zero → amplitude in a system of
→ stationary waves. See also
→ antinode. From L. nodus "knot;" cognate with necto "I bind," Skt. nahyati "binds, ties," Av. naska-, "bundle," Old Irish nascim "to bind," Old Norse knutr, Norwegian knut, Icelandic hnutur, O.E. cnotta, Modern E. knot, O.H.G. knotto, Ger. Knoten; PIE root *ned- "to bind, tie." Gereh "knot," from Mid.Pers. grih "knot;" Sogdian γr'nš "knot, bond, joining;" Khotanese grantha- "knot;" cf. Skt. granthi- "knot." |
orbital node gereh-e madâri Fr.: nœud orbital One of the two points of intersection of the orbit of a secondary body with the plane of reference through the primary. |
precession of the nodes pišâyân-e gereh-hâ Fr.: précession des nœuds The gradual change in he orbital planes of a binary system. → precession; → node. |
regression of the nodes pasraft-e gerehhâ , ~ gowzahrhâ Fr.: régression des noeuds The slow motion of the → nodes of the Moon's orbit in the opposite direction to the Moon's movement. This westward motion, caused by perturbations of other bodies, mainly the Earth and Sun, has a rate of 19.35 degrees per year, making one rotation in 18.6 years. → regression; → node. |