The Dragon. A large constellation that winds around the north → celestial pole, appearing to encircle → Ursa Minor. The north → ecliptic pole also lies within Draco. Abbreviation: Dra, genitive form: Draconis.
O.Fr. dragon, from L. draco "serpent, dragon," from Gk. drakon "serpent, seafish," from drak-, strong aorist stem of derkesthai "to see clearly," perhaps literally "the one with the (deadly) glance," cf. Av. darəs- "to look," huuarə.darəsa- "having the appearance of the sun," Skt. darś- "to see, appear, look, show," dárśya- "worthy of being seen;" PIE base *derk- "to look."
Eždahâ, from Mid.Pers. aždahâg, ažidahâk, from Av. aži.dahāka- "the name of an evil king in the Iranian mythology," from aži- "serpent; dragon, monster" (Mid.Pers. až, âž, aži), cf. Skt. áhi- "snake, adder," Gk. ékhis, óphis "snake," L. anguis "snake," Arm. auj, Russ. už, Lith. angis; PIE base *angw(h)i- "snake, worm." The etymology of the second component, Av. dahāka-, is a matter of discussion. It is probably related to dahaka- "stinging, tormenting," from dah- "to sting, to do harm."
Fr.: Naine du Dragon
A dwarf elliptical galaxy that is a satellite of our Galaxy and lies at a distance of about 250,000 light-years from the Galactic center. Its diameter is only about 3,500 light-years, and its absolute magnitude -8.6, making it the least luminous galaxy known.
mâh-e gowzahri (#), ~ gerehi (#)
Fr.: mois draconitique
The time interval between two successive passages of the Moon through its → ascending node, 27.212 220 days (27d 5h 5 m 35.8s). Draconic month is important for predicting → eclipses. Also called draconitic month, nodical month.
Draconic, adj. of dragon, → Draco, referring to a mythological dragon for the following reason. Since an eclipse occurs when the Earth, the Sun, and a node are aligned and moreover the Moon is situated near the node, it was believed that a dragon that resided in the node swallowed the Sun or the Moon. → month.
Mâh, → month.
Two meteor showers with radiants in the constellation → Draco. One appears early in October and the other late in June.
1) kerré, 2) vârâné; 3) kerridan, kerrandan
Fr.: 1) traînée, entraînement; 2) traînée; 3) traîner
1) General: The act of dragging or the state of being dragged.
From O.N. draga, O.E. dragan "to draw," from P.Gmc. *dragan "to draw, pull," from PIE base *dhragh- "to draw, drag on the ground" (cf. Skt. dhrajati "pulls, slides in," L. trahere "to pull," Rus. drogi "wagon."
Kerr, kerré, kerridan "drag," cf. Laki keronen, Hamadâni kerândan
"to pull along, drag," Tâleši kernye, Tabari kərəš "to drag;"
Lori, Hamadâni kerr "line, scratch;" related to
Mid/Mod.Pers. kešidan, kašidan "to draw, protract,
trail, drag, carry;" kâštan, keštan, kâridan
"to cultivate, to plant, to make furrows;" Av. kar- "to strew seed,
cultivate," kāraiieiti "cultivates,"
karš- "to draw (a furrow), till, plant;"
cf. Skt. kar- "to scatter, strew, pour out," kars-, kársati
"to pull, drag, plow;" Gk. pelo, pelomai "to move, to bustle;"
PIE base kwels- "to plow."
Fr.: champ de Draine
Named after B. T. Draine, 1978, ApJS 36, 595.
Fr.: équation de Drake
A probabilistic argument used to estimate the number of
→ intelligent, communicating
→ extraterrestrial civilizations in the
→ Milky Way galaxy. The Drake equation is:
Frank Donald Drake (1930-); → equation.
Fr.: dragage, remontée
From M.E. (Scots) dreg-, O.E. draeg- (in drægnet "dragnet"), akin to dragan "to draw" + up.
Birunkašid, past stem of birun kašidan, from birun "out, the outside" (Mid.Pers. bêron, from bê "outside, out, away" + rôn "side, direction," Av. ravan- "(course of a) river") + kašidan "to draw," Mid.Pers. kašitan, Av. karš- "to draw," Skt. kars-, kársati "to pull, drag, plough," Gk. pelo, pelomai "to be busy, to bustle."
nebigân-e Dresden (#)
Fr.: codex de Dresden
A pre-Colombian Maya manuscript consisting of numerous calendar and astronomical data, probably dating from the 12th century. It seems that it is an updated copy of a document from the period of the old Maya Empire (4th-9th centuries). It contains a table which covers over 32 years, grouping 45 successive → lunations, divided into 69 groups of 5 or 6 lunations. The data are calculated in days and correspond remarkably to the intervals in an eclipse table: each group ends at the probable date of a solar eclipse (M.S.: SDE).
Dresden refers to the Dresden Library where the original document is preserved. It was bought in 1739 by the library director, Johann Christian Götze, who found it in a private library in Vienna. Its earlier history is unknown; codex, from L. codex earlier caudex "book, book of laws," literally "tree-trunk, book (formed originally from wooden tablets);" → codex.
1) delek; 2) delekidan
Fr.: 1) dérive; 2) dériver
1a) General: A driving movement or force; impulse; impetus; pressure.
From M.E. drift, from O.E. drifan "to drive," or from O.N. or M.Du. drift, from P.Gmc. *driftiz, related to *dribanan "to drive."
Delek from Lori, Laki, Hamadâni, Malâyeri "push, shove, drive;" variants Gilaki duko, Tâleši dako, Baluchi dhakkk(a) "push, shove, blow," Choresmian dh- "to hit," Kurd. dân/di- "to beat, hit," Proto-Iranian *daH- "to beat, hit, strike" (Cheung 2007); PIE base *dhen- "to hit, push;" delekidan, verb from delek.
Fr.: courbe de passage
In radio astronomy, the output response as a function of position for a given filter as the source passes through the beam.
Fr.: taux de dérive
The amount of drift, in any of its several senses, per unit time.
Fr.: vitesse de dérive
The average velocity of a charged particle in a plasma in response to an applied electric field.
1) rândan (#); 2) râneš (#), râné (#)
Fr.: 1) entraîner; 2) entraînement
1a) To cause to move, to force to act.
→ continuum-driven wind,
→ dust-driven wind,
→ line-driven wind,
→ radiation-driven implosion,
→ radiation-driven mass loss,
→ radiation-driven wind.
M.E. driven; O.E. drifan; cf. O.N. drifa, Goth. dreiban.
Rândan "to cause to go," causative of raftan "to go, walk, proceed" (present tense stem row-, Mid.Pers. raftan, raw-, Proto-Iranian *rab/f- "to go; to attack").
Fr.: précision de guidage
The accuracy with which a telescope is moved by alpha or delta drives.
narmé bârân (#)
Fr.: bruine, crachin
Very small, numerous, and uniformly distributed water drops that may appear to float while following air currents. Unlike fog droplets, drizzle falls to the ground.
Drizzle, dryseling "a falling of dew," from M.E. drysning, related to dreosan "to fall," cf. O.S. driosan, Goth. driusan.
Narmé bârân literally "smooth rain," from narmé, from narm "soft; smooth; mild," Mid.Pers. narm + bârân, → rain.
1) cekké; 2) cekidan
Fr.: 1) goutte; 2) tomber goutte à goutte
1a) A small quantity of liquid that falls or forms in a round or pear-shaped mass.
M.E. drop(e), from O.E. dropian; related to O.H.G. triofan, Du. drop, Ger. Tropfen.
Cekké, cekidan "drop; small, minute," cekidan "to drop."
A very small drop of a liquid.
→ drop + diminutive suffix let.
Fr.: lumière de Drummond
A very brilliant white light which is the ignited flame of a mixture of oxygen and hydrogen projected against a block of calcium oxide (lime). Also called limelight. First working version produced by Lieutenant of the Royal Engineers, upon the Ordnance Trigonometrical Survey of Ireland (1826). It was used at night as a substitute for solar light. It was first employed in a theater in 1837 and was in wide use by the 1860s, among which in photography.
Named after Scottish engineer Thomas Drummond (1797-1840); → light.
Fr.: sec, aride
1) Lacking moisture; not damp or wet.
M.E. drie; O.E. dryge; cf. M.L.G. dröge, M.Du. druge, Du. droog, O.H.G. trucchon, Ger. trocken.
Xošk "dry;" Mid.Pers. xušk "dry;" O.Pers. uška- "mainland;" Av. huška- "dry;" cf. Skt. śuska- "dry, dried out;" Gk. auos "dry, dried up;" O.E. sēar "dried up, withered;" Lith. sausas "dry, barren."