1) sâyân (#); 2) tânžânt
1) A straight line or plane that touches a curve or curved surface at one and only one
point. Conversely, a curve or curved surface that touches a straight line, curve, or curved
surface at one and only one point.
From L. tangentem (nominative tangens), pr.p. of tangere "to touch," from PIE base *tag- "to touch, to handle" (cf. L. tactus "touch," Gk. tetagon "having seized," O.E. þaccian "stroke, strike gently"); tânžânt, loan from Fr.
1) Sâyân, pr.p. of sâyidan "to touch, to rub," variants
Khotanese sauy- "to rub;" Sogdian ps'w- "to touch;" ultimately
Proto-Iranian *sau- "to rub."
Pertaining to or of the nature of a tangent.
Fr.: mouvement tangentiel
That component of a an object's motion which is perpendicular to the observer's → line of sight.
Fr.: vitesse tangentielle
1) The instantaneous linear velocity of a body moving in a circular path.
It is equal to the → angular velocity multiplied
by the radius: vt = ωr.
tangentially polarized light
nur-e qotbide-ye sâyâni
Fr.: lumière polarisée tangentiellement
The → linearly polarized light that vibrates perpendicularly to an imaginary line joining the source to the point of observation.
A long, narrow strip of paper, plastic, metal, etc., as in → magnetic tape
M.E.; unexplained variant of tappe; O.E. tæppe "strip (of cloth)," akin to M.L.G. teppen "to tear, pluck."
Navâr "a narrow, long piece, strip, rope," cf. Ossetic nawar "tendon, sinew;" Av. snāvarə- "tendon, sinew;" cf. Skt. snāvan- "tendon, sinew;" Pali nahāru-, nhāru- "tendon, muscle;" Hindi nahāru "piece of leather;" Arm. neard "tendon;" Gk. neura "string, sinew;" L. neros "sinew, muscle, nerve;" Ir. sin "chain;" P.Gmc. *senawo (O.S. sinewa, O.N. sina, O.Fris. sine, M.Du. senuwe, O.H.G. senawa, Ger. Sehne, E. sinew)
Fr.: Nébuleuse de la Tarantule
The largest and brightest → H II region in the → Large Magellanic Cloud. This → giant H II region has a diameter of over 800 → light-years, and contains half a million → solar masses of ionized gas. The ionization is produced by several clusters of → O-type and → B-type stars, including the very powerful and compact cluster → R136 near its centre. The nebula's name comes from its spider-like shape. Also known as → 30 Doradus and NGC 2070.
Tarantula "any of several large, hairy spiders of the family Theraphosidae," from M.L. tarantula, from It. tarantola, from Taranto "seaport city in southern Italy in the region where the spiders are frequently found," from L. Tarentum, from Gk. Taras; → nebula.
Miq, → nebula; roteyl "large, hairy spider, tarantula."
Tarazed, from Pers. tarâzu "balance, scales," from šâhin-e tarâzu "the beam of the balance," the name given to the three aligned stars of Aquila, i.e. α, β, and γ (Abdolrahmân Sufi, Book of Fixed Stars, A.D. 964, Pers. translation by Nasireddin Tusi in 13th century). The first word, šâhin, apart from "beam," means "royal" and "falcon." Tarâzu, from Mid.Pers. tarâzên-, tarâzênidan "to weigh;" Proto-Iranian *tarāz-, from *tarā- "balance, scales" (cf. Skt. tulā- "scales, balance, weight," from tul- "to weigh, make equal in weight, equal," tolayati "weighs, balances;" L. tollere "to raise;" Gk. talanton "balance, weight," Atlas "the Bearer" of Heaven;" Lith. tiltas "bridge;" PIE base telə- "to lift, weigh") + Av. az- "to convey, conduct, drive," azaiti drives" (cf. Skt. aj- "to dive, sling," ájati "drives," ajirá- "agile, quick," Gk. agein "to lead, guide, drive, carry off," L. agere "to do, set in motion, drive," from PIE root *ag- "to drive, move," → act).
An object to be observed with a telescope.
M.E., from M.Fr. targuete, from O.Fr. targe "light shield," from Frank. *targa "shield" (cf. O.H.G. zarga "edging, border," Ger. Zarge "edge, border").
Âmâj "aim, goal," from Proto-Iranian base *āma-, from prefix *ā- + *ma- "to measure;" cf. Av. mati- "point, tip;" O.Pers./Av. mā(y)- "to measure;" Pers. mun/mân "measure," as in Pers. terms pirâmun "perimeter," âzmun "test, trial," peymân "measuring, agreement," peymâné "a measure; a cup, bowl;" cf. Skt. mati "measures," matra- "measure," Gk. metron "measure," L. metrum; PIE base *me- "to measure."
A reddish-brown deposit consisting mainly of potassium hydrogen tartrate, which forms during the fermentation of wine. Same as → argol.
From O.Fr. tartre, from L. tartarum, from late Gk. tartaron "tartar encrusting the sides of wine casks," perhaps relating to Pers. dord (?).
Dord "lees, dregs, sediment, tartar of wine."
asid târtârik (#)
Fr.: acide tartarique
An organic acid with general chemical formula C4H6O6 that exists in four isomeric forms . The common form, d-tartaric acid, obtained from → tartar, is a white, soluble, crystalline solid. It occurs naturally in many plants, particularly in grapes, bananas, and tamarinds. It is also one of the main acids found in wine.
1) A definite piece of work required to be done as a duty or routine job.
M.E., from M.L. tasca, metathetic variant of taxa "tax," from taxare "evaluate, estimate, handle," also "censure, charge."
Taš, created from Proto-Ir. root *taš- "to make, construct; to cut;" cf. Av. tāš- "to make, construct; to cut;" O.Pers. (ham)taxš- "to work with, effect;" Mid.Pers. tâš- "to cut, cleave; create;" Mod.Pers. taš, tišé "hatchet, axe, adze," tarâšidan "to shave;" Ossetic I. dasyn/dast "to shave;" Munji tiž-, Yidgha tiž- "to shear;" Pash. toq "to shave;" cf. Skt. taks- "to form (by cutting), to build, prepare;" Gk. tekton "carpenter."
gonârgar-e taš, taš-gonârgar
Fr.: gestionnaire de tâches
Th Bull. A large constellation of the → Zodiac, in the northern hemisphere at about 4h 20m right ascension, 16° north declination. Alpha Tauri or → Aldebaran is among the twenty brightest stars in the sky. Taurus contains several star clusters, including the → Pleiades and → Hyades. The famous → Crab nebula is situated to the west of Zeta Tauri. Abbreviation: Tau; Genitive: Tauri.
From L. taurus "bull," from PIE *tauro- "bull" (cf. Gk. tauros; O.C.S. turu "bull, steer;" Lith. tauras "aurochs;" O.Pruss. tauris "bison"), often said to be from PIE *steu-ro- "be big, be strong, be sturdy" (cf. Pers. sotur, Mid.Pers. stôr "horse, mount; large cattle;" Av. staora- "bovine animals;" O.Icelandic stjôrr; Goth. stiur "young bull;" O.E. steor; E. steer).
Gâv "bull, ox, cow;" Mid.Pers. gâw "ox, bull, cow; Taurus;" Av. gao- "cow, ox, bull;" cf. Skt. gaus; Gk. bous "ox;" L. bov-; Armenian kov; O.E. cu; E. cow; PIE base *gwou- "ox, bull, cow."
1) Needless repetition of an idea, especially in words other than those
of the immediate context, without imparting additional force or
clearness, as in "lifeless dead."
L.L. tautologia "representation of the same thing in other words," from Gk. tautologia, from tautologos "repeating what has been said," from tauto "the same" (contraction of to auto "the same," from to "the" + → auto + -logos "saying," related to legein "to say," → -logy.
Hamân "same" (Mid.Pers. ham "same; also; together," → com-) + ân "that."
Fr.: colonne de Taylor
A phenomenon in which the relative motion of a homogeneous rotating liquid tends to be the same in all planes perpendicular to the axis of rotation. When a rotating fluid comes into contact with a submerged object, the fluid flows around it as if it were a cylinder extending the entire depth of the fluid parallel to the axis of the system.
Fr.: nombre de Taylor
A → dimensionless number indicating the relative importance of the → centrifugal and → viscous forces in the → Taylor-Couette flow. It is also called rotational Reynolds number. Its value depends on the length scale of the convective system, the rotation rate, and → kinematic viscosity. The Taylor number Ta is expressed by Ω2Rd3/ν2 where Ω is the → angular velocity of the inner cylinder, R = (R1 + R2)/2 is the mean radius of the two cylinders, d = R2 - R1 is the distance between the cylinders, and ν is → kinematic viscosity. If Ta is equal or greater than one, the rotational effects are significant.
Named after Geoffrey Ingram Taylor (1886-1975), a British physicist, mathematician, and expert on fluid dynamics and wave theory; → number.
seri-ye Taylor (#)
Fr.: série de Taylor
A series expansion of an infinitely differentiable function about a point a: Σ (1/n!) (x - a) n f n (a), where fn(a) is the n-th derivative of f at a, and the sum over n = 0 to ∞. If a = 0 the series is called a → Maclaurin series.
Named for the English mathematician Brook Taylor (1685-1731); → series.
Fr.: écoulement de Taylor-Couette
The → Couette flow between two concentric cylinders with fluid filling the annular region. The flow is generated by the relative rotation of the two cylinders. Under some physical conditions the flow may undergo the → Taylor-Couette instability.
Fr.: instabilité de Taylor-Couette
A hydrodynamic instability in the → Taylor-Couette flow that arises when the rotation velocity of the fluid exceeds a critical value. The instability arises for → Taylor numbers larger than about 1700. At the beginning the fluid elements will move in simple rolls, but turbulence in the form of complex spirals will appear with increasing rotation velocity.