<< < -ab ab- abo abs abs acc acc aco act ad add adj aeo afo agr Alf alg Alk Aln Alp alt amb ana And ang ani ano ant ant Ap apo app app Ara arc Ari ars asp ast ast ast ath ato att aur aut axi > >>
Arago point noqte-ye Arago Fr.: point d'Arago A → neutral point located at about 20° above the → antisolar point. Named for François Arago (1786-1853), French physicist; → point |
arbitrary kâmsar Fr.: arbitraire 1) Based on individual will or choice rather than by reason or necessity. M.E., from O.Fr. arbitraire or directly from L. arbitrarius "depending on the will, uncertain," from → ad- "to" + baetere "to come, go." Kâmsar, literally "at one's will," from kâm "desire, wish; cause, reason," → despite, + sar "person, individual," originally "→ head." |
arbitrary constant pâyâ-ye kâmsar Fr.: constante arbitraire A constant quantity in → equations which takes various values but which remains unaffected by the changes in the values of the → variables of the equation. Most → differential equations have more than one → solution. In general, the number of arbitrary constants of an ordinary differential equation is given by the → order of the highest → derivative. |
arborescence šâkedâri Fr.: arborescence 1) In → graph theory, a → rooted tree
that has a natural orientation in which all → paths
are directed away from the → root. More specifically, a
→ directed graph in
which, for a → vertex u, called the
→ root, and any other vertex v,
there is exactly one → directed path
from u to v. From Fr. arborescence, from → arborescent + → -ance. Šâkedâri, nous from šâkedâr, → arborescent. |
arborescent šâkedâr Fr.: arborescent Having the shape or characteristics of a tree in growth, structure, or appearance. From Fr. arborescent, from L. arborescent-, p.p. of arborescere "to grow into a tree," from arbor, arboris "tree." Šâkedâr "having branches," from šâké, from šâxé, → branch, + dâr "having, possessor," from dâštan "to have, to possess," → charged. |
arc kamân (#) Fr.: arc 1) General: Something shaped like a → curve
or → arch. M.E. ark, from M.Fr. arc "bow," from L. arcus "bow, arch" (cf. Goth. arhwazna "arrow," O.E. earh), PIE *arqu- "bowed, curved." Kamân "arc, bow" from Mid.Pers. kamân, related to xam "curve," cf. Breton kamm "curved, bent," Gk. kampe "a corner, a joint," L. campus "a field," Lith. kampus "corner," PIE *kamb- "to bend, crook." |
arc minute kamân-daqiqé, daqiqe-ye kamâni Fr.: minute de degré A unit of angular size equal to 1/60 of a degree. |
arc of light kamân-e nur Fr.: arc de lumière The apparent angular separation (→ elongation) between the → centers of the → Sun and the → Moon. |
arc of separation kamân-e jodâyi Fr.: arc de séparation The difference in → right ascension between the → Sun and the → Moon, measured in degrees. → arc; → separation. |
arc of vision kamân-e did Fr.: arc de vision The → angular → difference in → altitude between the → Sun and the → Moon. |
arc second kamân-sâniyé, sâniye-ye kamâni Fr.: seconde de degré A unit of angular size equal to 1/3.600 of a degree. |
arc spectrum binâb-e kamân Fr.: spectre d'étincelle The spectrum produced by an atom or mixture of atoms as a result of vaporization within an electric arc generated between two electrodes. |
arch tâq (#) Fr.: arc 1) A curved structure, normally in the vertical plane, that spans an opening. M.E. arch(e), from O.Fr. arche "arch of a bridge," from L. arcus "a bow," → arc. Taq "arch," from tâk, contraction of târak, → vertex. |
arch of foot tâq-e pâ Fr.: arche du pied Any of the four vaulted structures in the foot: the internal (medial) longitudinal, the outer (lateral) longitudinal, and two transverse (Medical Dictionary, Farlex). |
archaeoastronomy bâstânaxtaršenâsi Fr.: archéoastronomie The study that deals with the astronomical knowledge of prehistoric peoples (season events, calendars, observing sites, astronomical alignments) and its influence on their cultures and societies (mythologies, religions, life). Archaeoastronomy covers the intersection between astronomy and archaeology. Same as → astroarchaeology, megalithic astronomy. Archeoastronomy, from L. archaeo-, archeo "ancient; earlier; primitive," from Gk. arkhaio-, from arkhaios "ancient" + → astronomy. Bâstânaxtaršenâsi, from bâstân "ancient" + axtaršenâsi, → astronomy. |
arche- sar- (#) Fr.: arché-, archi A prefix meaning "principal, prior, original, first, early" Same as archi-. → archetype. From Gk. arkhe-, from arckhon "ruler," noun use of p.p. of arkhein "to rule." Sar-, from sar "top, summit, the capital of a pillar," → head. |
Arches cluster xuše-ye tâqhâ Fr.: amas des Arches One of the three → Galactic center clusters supposed to be the densest young → massive star cluster in the Milky Way. It contains the richest collection of → O stars and → WN Wolf-Rayet stars in any cluster in the Galaxy, thus representing the largest collection of the most massive stars in the Galaxy. With its estimated age of 2-3 million years, the Arches cluster is the youngest of the massive clusters in the Galactic center. → Quintuplet cluster; → Central cluster (Figer et al. 2002, ApJ 581, 258; and 1999, ApJ 525, 750). Arches, from the presence of Galactic center thermal → arched filaments, about 100 → light-years in projection from the Galactic center (Morris & Yusef-Zadeh, 1985, AJ 90, 2511), from M.E. arche, O.Fr. arche "arch of a bridge," from L. arcus, → arc; → cluster. |
archetype sarnemun (#) Fr.: archétype The original pattern or model from which all things of the same kind are copied or on which they are based; a model or first form; prototype (Dictionary.com). |
Archimedes' principle parvaz-e Arašmidos Fr.: principe d'Archimède A body immersed totally or partially in a liquid is buoyed up by a force equal to the weight of the liquid displaced by the body. → buoyancy. Archimedes of Syracuse (c. 287 BC - c. 212 BC), Greek mathematician and inventor; → principle. Arašmidos altered form of Archimedes in classical Ar. texts; parvaz, → principle. |
architecture mehrâzik (#) Fr.: architecture 1) The art or practice of designing and building structures. M.E., from M.Fr. architecture, from L. architectura, from architectus "architect," from Gk. arkhitekton "master builder, director of works," from arkhi- "chief" + tekton "builder, carpenter," → technique. Mehrâzik, from mehrâz literally "chief mason," from meh- "great, large," → high, + râz "mason, builder" (Borhân-e Qâte'), from Mid.Pers. râz "builder, architect," probably related to O.Pers. râs-, Av. râz- "to direct, set, put in line" (with many cognates in Pers., such as râst "straight, direct, true;" raj, rak, râk, rezg (Lori), radé, râdé "line, rule, row," rasté, râsté "row, a market with regular ranges of shops;" ris, risé "straight"); cf. Skt. raj- "to direct, stretch," rjuyant- "walking straight;" Gk. orektos "stretched out;" L. regere "to lead straight, guide, rule," p.p. rectus "right, straight;" Ger. recht; E. right; PIE base *reg- "move in a straight line," hence, "to direct, rule;" + -ik, → -ics. |
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