Fr.: raie alcaline
A spectral line produced by an → alkali metal.
felez-e qalyâyi (#)
Fr.: métal alcalin
Any of the chemical elements belonging to group A of the → periodic table, which burn vigorously in air; i.e. → lithium, → sodium, → potassium, → rubidium, → cesium, and → francium. Alkali metals have a → valence of one and are softer and less dense than other metals.
From alkal(i) + -ine a suffix denoting "of or pertaining to," "of the nature of," "like."
From qalyâ, → alkali, + -yi adj. suffix.
alkaline earth metal
felez-e qalyâyi-ye xâki (#)
Fr.: terre alcaline
Any of the metallic chemical elements belonging to group 2 of the → periodic table; i.e. → beryllium, → magnesium, → calcium, → strontium, → barium, and → radium. They are not found free in the nature because they are highly reactive.
Fr.: tout, tous
The whole quantity or amount.
M.E. al, plural alle; O.E. eall "all, every, entire;" cf. O.Fris., O.H.G. al, O.N. allr, Goth. alls.
Hamé- "all," variant hami "all the time, always;" Mid.Pers. hamâg "all," hamê "all the time, always;" Av. hama- "any;" cf. Skt. sama-"any, every, whichever;" Gk. amo-then "whichever;" Goth. sums "any;" O.N. sumr "any;" O.E. sum "some;" E. some.
Fr.: relevé sur tout le ciel
1) The act of allying or state of being allied; the result of this action.
1) General: To assign or allot for a particular purpose.
From M.L. allocate imperative plural of allocare "allocate," from → ad- "to" + locare "to place," from locus "a place."
Teskidan, from tesk "portion, share, part, lot; a tax upon lands, tribute extracted," variants tešk, toxs (kardan) "distribute, divide;" loaned in Ar. tisq, tasq; tasu "a weight of four barley corns; the twenty-forth part of a weight;" Mid.Pers. tasû "the fourth part," loaned in Ar. tassûj, in Syriac tassûgâ "the fourth part; a measure;" ultimately Proto-Ir. *caçû-ka-; cf. Av. caθwarô, catur-, → four.
The act of allocating; the state of being allocated.
Verbal noun of → allocate.
From allo-, combining form of Gk. allos "other, different;" cf. L. alius "else;" → alias + trope, from Gk. -tropos "a turn, way, manner," from tropein "to turn;" PIE base *trep- "to turn" (cf. L. trepit "he turns").
Degarvâr, from degar "other, another" (Mid.Pers. dit, ditikar "the other, the second;" O.Pers. duvitiya- "second;" Av. daibitya-, bitya- "second;" Skt. dvitiya- "second;" PIE *duitiio- "second") + -vâr denoting "resembling, like;" Mid.Pers. -wâr; Av. -vara, -var; cf. Skt. -vara.
Fr.: bande permise
In solid-state physics, the range of energies which electrons can attain in a material.
P.p. of v. allow, from O.Fr. alouer "approve," from L. allaudare , compound of → ad- "to" + laudare "to praise."
A material composed of two or more → metals, or of a metal or metals with a non-metal, exhibiting characteristic metallic properties. Some examples: → bronze is an alloy of → copper and → tin, brass is an alloy of → zinc and copper, and → steel is an alloy of → iron and → carbon. Alloys have properties which differ from those of their components. Moreover, different component proportions yield alloys with different properties.
Âlyâž, loanword from Fr.
Almach (γ Andromedae)
The third brightest star in Andromeda and one of the most beautiful double stars in the sky. The brighter star of the pair appears golden yellow or slightly orange; it is a bright (of second magnitude) giant K star. The fainter companion, which appears greenish-blue, is also double.
This star is also known as Almaak, Alamak, Almak, or Almaach, from Ar. Al-'Anaq al-'Ardh "a small animal of Arabia similar to a badger."
A comprehensive treatise, compiled by Claudius Ptolemy of Alexandria, around A.D. 140, that summarized the astronomy, geography, and mathematics of antiquity, and included a star catalogue with data for 1,022 stars.
Almagest, from Ar. Al-majisti, from al "the" + Gk. megiste (suntaxis) "the greatest (composition)," from femenine of megistos, superlative of megas "great."
A book of tables, usually covering a period of one calendar year, that lists the future positions of the Moon, planets, and other prominent celestial objects, together with other useful astronomical data.
M.E. almenak, from M.L. almanach, perhaps from late Gk. almenikhiaka "ephemeris," perhaps of Coptic origin.
moqantar, parhun-e farâzâ
A small circle on the celestial sphere parallel to the horizon. The locus of all points of a given altitude. Also called altitude circle, circle of altitude, parallel of altitude.
Almucantar, from L. almucantarath, from Ar. almuqantarât, from al- "the" + muqantarât "sundial," from qantarah "arch".
Alnath (β Tau)
Nâteh (#), šâxzan (#)
Alnath, from Ar. An-nâteh "the butting" (horn), from nath "to butt".
Šâxzan "the butting," from Mod.Pers. šâx zadan "to butt or push with the horns," from šâx "horn" + zadan "to strike, to butt".
Alnilam (ε Orionis)
The central and brightest of the three stars in → Orion's Belt and the fourth brightest in the whole of → Orion. Alnilam is a blue-white → supergiant of → spectral type B0 Iae with a → visual magnitude of 1.70 and a → luminosity of 375,000 times the → solar luminosity. It lies at about 1,340 → light-years.
Alnilam, from Ar. An-Nizam al-Jawza'
Alnitak (ζ Orionis)
The left hand or easternmost star in → Orion's Belt, which is the fifth brightest in the whole of → Orion with a → visual magnitude of 1.79. Alnitak is a wide visual binary system consisting of components ζ Ori A (HR 1948) and ζ Ori B (HR 1949), currently separated by ~ 2''.4. ζ Ori A is a → close binary system comprising Alnitak Aa and Alnitak Ab. Aa is a hot → blue supergiant of → spectral type O9.5 Iab with an → absolute magnitude of -6.0 and an → apparent magnitude of 2.08. Its mass is estimated as being up to 33 times as massive as the Sun and to have a diameter 20 times greater. It is some 250,000 times more luminous than the Sun, with a surface temperature of about 30,000 K. It is the brightest star of class O in the night sky. Alnitak Ab is a blue → subgiant of spectral type B1 IV with an absolute magnitude of -3.9, an apparent magnitude of 4.3, and a mass of 14 Msun. Ab revolves around Ab with a period of 2,687 days. The system has a 4th magnitude companion, Alnitak B, nearly 3 arc-seconds distant. It is a B0 III type star which orbits Alnitak A every 1,500 years. Alnitak is associated with the → emission nebula → IC 434 containing the → Horsehead Nebula.A much fainter fourth component, ζ Ori C, is located about 57'' away from ζ Ori Aa (C. A. Hummel et al., 2013, A&A 554, A52, arXiv:1306.0330).
Alnitak, from Ar. An-Nitaq al-Jawza'