advance of perihelion
Fr.: avance du périhélie
The slow rotation of the major axis of a planet's orbit in the same direction as the revolution of the planet itself, due mainly to gravitational interactions with other planets. The perihelion of the planet Mercury advances about 9'.6 per century. The bulk of the advance was accounted by perturbations from other planets. However, a remaining small advance, by 43'' per century, was eventually explained as an effect predicted by Einstein's theory of → general relativity. In the case of close binary stars, the advance of pericenter may additionally be caused by mass transfer and the stars' distorted (elliptical) shapes. Advance of perihelion (or pericenter) is also known as → apsidal motion.
Advance, from O.Fr. avancer "move forward," from V.L. *abantiare, from L.L. abante "from before," from ab- "from" + ante "before," PIE *ant- "front, forehead;" → perihelion.
Pišraft "advance," from piš "forward; in front; before," Mid.Pers. peš + raft "going; walk, travel," from raftan "to go."
Fr.: onde avancée
A wave that travels backward in time according to Maxwell's electromagnetic theory; it arrives before it is transmitted. → Maxwell's equations have two solutions, the normal solution describes the ordinary waves, called → retarded waves, traveling forward in time. However, no advanced waves have ever shown up in any experiment. The advanced solutions of Maxwell's equations are usually simply discarded as "unphysical."
Advanced, adj. from advance, → advance of perihelion; → wave.
Mowj, → wave; pišras "advanced," from piš "before," Mid.Pers. peš + ras "arriving," from rasidan "to arrive," Mid.Pers. rasitan, O.Pers./Av. rasa- present stem of ar- "to move, go or come toward," cf. Skt. ar-, rcchati.
1) Geology: The process of transport of a quantity by the velocity
field due to the movement of a fluid. Advection differs from
→ convection, which describes thermally driven
From L. advecti "act of conveying," from advectus, past participle of advehere "to carry," from ad-, "to" + vehere "to carry, bring;" Skt. vah-, vahati "to carry, conduct, guide," Av. vaz-, vazaiti "to guide, lead"; PIE *wegh- "to go, transport in a vehicle".
Fr.: terme d'advection
The first term on the right side in the → induction equation.
Adj. from → advection.
A word that serves to qualify a verb, an adjective, another adverb, or an entire sentence. More specifically, adverbs indicate manner, time, place, cause, or degree, and answer questions such as "how," "when," "where," "how much."
1) A person, group, or force that opposes or attacks; opponent; enemy; foe.
Hamestâr, from Mid.Pers. hamestâr "adversary," from Av. hamaēstar-, from ha-, → com-, + maēd- "to bring down, to suppress."
A round vessel pivoted on a central axis that rotates by the force of internal steam escaping from two diametrically opposed narrow apertures. Aeolipile, first described by Hero of Alexandria (c. 10-70 AD), is an early example of → jet propulsion.
L aeolipila, from Gk aiolipyle, from Aiolon pyle, fr. aioli-, from Aiolos "god of wind," + pyle "gate."
1) General: An indefinitely long period of time; an age.
L. aeon, from Gk. aion "age, eternity;" akin to Av. āiiu- "duration, period, lifetime;" Skt. áyu- "life, longevity."
Âyu, from Av. āiiu- "duration, period, lifetime" (Sogd. āy "life, age"), as above.
Of or pertaining to → aerodynamics.
Fr.: force aérodynamique
A stony meteorite consisting of silicate minerals. This alternative name for a stony meteorite, is now largely obsolete.
Aerolite, from Gk. aero-, → air, + Gk. lithos "stone".
Havâsang from Persian havâ "air"; compare with Mid. Pers./Mod. Pers. vây "weather," from Av. vayah-, vaya- "weather, atmosphere," from va- "to blow". Cognate with Skt. va-, Gk. aemi "to blow" + sang, → stone.
A subdivision of meteorology concerned with the total vertical extent of the atmosphere as opposed to the study of the atmosphere near Earth's surface.
Aerology from Gk. aero- "air" + Gk. logia "study of," from legein "to speak".
Javvšenâsi, from Ar. javv "air, atmosphere" + šenâsi "knowledge, knowing," from šenâxtan "to know," from Av./O.Pers. xšnâ "to learn, come to know, know," compare with Skt. jna "to know," Gk. gignoskein "to know, think, judge," L. gnoscere, noscere "to come to know," PIE *gno- "to know."
The science and technology concerned with designing, constructing, and operating machines capable of flying in the atmosphere.
From aeronautic, from Fr. aéronautique, from aéro-, from Gk. aer, → air, + nautique "of ships," from L. nauticus, from Gk. nautikos, from naus "ship" (cognate with Mod.Pers. nâv "ship;" Av./O.Pers. *nāv-, O.Pers. nāviyā- "fleet;" Skt. nau-, nava- "ship, boat;" Gk. naus, neus, L. navis; PIE *nāu- "ship").
Havânavardi, from havâ, → air, + navardi, verbal noun of navardidan "to travel, walk, pass by and over."
The study of the upper atmosphere, especially of regions of ionized gas.
From Gk. aer- "weather" + nomos "arranging, regulating," related to nemein "to deal out."
Vâyšenâsi from Mid. Pers./Mod. Pers. vây "weather," Av. vayah-, vaya- "weather, atmosphere," from va- "to blow;" cf. Skt. va-; Gk. aemi "to blow;" Av. vāta- "wind;" Skt. vata-; L. ventus, Mod. Pers. bâd, → wind; PIE *we- "to blow".
A suspension of fine solid or liquid particles in a gas.
Aerosol from aero "air" + sol(ution).
Havâlu from havâ "weather" + lu from → luyé, luyeš, → solution.
zibâyik, zibâ-šenâxti, zibâ
Relating to the philosophy of → aesthetics.
Adjective from → aesthetics.
zibâyik (#), zibâyi-šenâsi
1) The branch of philosophy dealing with such notions as the beautiful, the ugly,
the sublime, the comic, etc., as applicable to the fine arts, with a view to establishing
the meaning and validity of critical judgments concerning works of art, and the
principles underlying or justifying such judgments.
From Ger. Ästhetisch or Fr. esthétique, both from Gk. aisthetikos "sensitive, perceptive," from aisthanesthai "to perceive, to feel."
From L. affixus "fastened to," p.p. of affigere "fasten to, attach," from af-, variant of → ad- "to" + figere "fasten."
Vand, variant band "tie, band," present stem of Mod.-Mid./Pers. bastan/vastan "to bind, shut;" Av./O.Pers. band- "to bind, fetter," banda- "band, tie;" cf. Skt. bandh- "to bind, tie, fasten;" PIE *bhendh- "to bind," cf. Ger. binden, E. bind.