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digit raqam (#) Fr.: chiffre A symbol, numeral, or graphic character that represents an integer. From L. digitus "finger, toe." Raqam, from Ar. |
digital raqami (#) Fr.: numérique 1) Of or pertaining to a digit. |
digital computer râyângar-e raqami (#) Fr.: ordinateur numérique A computer that accepts and operates with → discrete data in the form of combinations of digits, letters, or other characters. In modern terminology, generally called computer. |
digitize raqamidan (#) Fr.: numériser To convert an → analogue signal to a → digital signal that represents the same information as the analogue signal. |
dihedral dodime-yi Fr.: dihédral 1) Having formed by two half-planes which intersect. |
dihedral angle zâviye-ye dodimi Fr.: angle dièdre An angle formed by two planes meeting along a common line. Compare with → face angle. |
dihedron dodimé Fr.: dièdre A figure formed by two intersecting planes. |
dilate 1) farâxândan; 2) farâxidan (#) Fr.: 1) dilater; 2) se dilater 1) (v.tr.) To make wider or larger; cause to expand. M.E. dilaten, from O.Fr. dilater, from L. dilatare "make wider, enlarge," from → dis- "apart" + latus "wide," → latitude. Farâxândan, farâxidan, infinitive from farâx "broad, wide, spacious;" Mid.Pers. frâxv, fraxv "broad, wide," frâxvitan, frâxvênitan "to spread." |
dilation farâxeš (#) Fr.: dilatation The act of dilating; state of being dilated. Also dilatation. Verbal noun of → dilate. |
dilute 1) owtâl; 2) owtâlidan Fr.: 1) dilué; 2) diluer 1) (adj.) Describing a solution that is reduced in concentration. From L. dilutus, p.p. of diluere "dissolve, wash away," from → dis- "apart" + -luere, combining form of lavere "to wash;" cf. Pers. lur "flood" [Mo'in, Dehxodâ] (variants Lori, Kordi: laf, lafow, lafaw, Tabari: lé); Gk. louein "to wash;" Bret. laouer "trough;" PIE base *lou- "to wash." Owtâl, from Tabari utâl, "having water, impregnated with water, waterlogged," from ow "water," → water + tâl variant of dâr "having, possessor," from dâštan "to have, to possess" (Mid.Pers. dâštan; O.Pers./Av. root dar- "to hold, keep back, maitain, keep in mind;" Skt. dhr-, dharma- "law;" Gk. thronos "elevated seat, throne;" L. firmus "firm, stable;" Lith. daryti "to make;" PIE base *dher- "to hold, support"). |
dilution owtâleš Fr.: dilution The process of reducing the concentration of solute in a solution by increasing the proportion of solvent. Verbal noun of → dilute. |
dilution factor karvand-e owtâleš Fr.: facteur de dilution The energy density of a radiation field divided by the equilibrium value for the same color temperature. |
dim tiré (#) Fr.: faible, pâle, mat(e) Not bright; obscure from lack of light. O.E. dimm "dark, gloomy, obscure," from P.Gmc. *dimbaz. Tiré, from Mid.Pers. têrag, variant of târig "dark," Av. taθra- "darkness," taθrya- "dark," cf. Skt. támisrâ- "darkness, dark night," L. tenebrae "darkness," Hittite taš(u)uant- "blind," O.H.G. demar "twilight." |
dimension vâmun Fr.: dimension 1) Math.: Independent extension in a given direction; a property of space. From L. dimensionem (nom. dimensio), from stem of dimetri "to measure out," from → dis- + metri "to measure." Vâmun, from vâ-, → dis-, + mun, variant mân "measure" (as in Pers. terms pirâmun "perimeter," âzmun "test, trial," peymân "measuring, agreement," peymâné "a measure; a cup, bowl"), from O.Pers./Av. mā(y)- "to measure;" PIE base *me- "to measure;" cf. Skt. mati "measures," matra- "measure;" Gk. metron "measure;" L. metrum. |
dimensional vâmuni Fr.: dimensionnel Of or pertaining to → dimension. |
dimensional analysis ânâlas-e vâmuni, ânâkâvi-ye ~ Fr.: analyse dimensionnelle A technique used in physics based on the fact that the various terms in a
physical equation must have identical → dimensional formulae
if the equation is to be true for all consistent systems of unit. Its main uses are: → dimensional; → analysis. |
dimensional formula disul-e vâmuni Fr.: formule dimensionnelle Symbolic representation of the definition of a physical quantity obtained from its units of measurement. For example, with M = mass, L = length, T = time, area = L^{2}, velocity = LT^{-1}, energy = ML^{2}T^{-2}. → dimensional analysis. → dimensional; → formula. |
dimensionless quantity candâ-ye bivâmun Fr.: quantité sans dimension A quantity without an associated → physical dimension. Dimensionless quantities are defined as the ratio of two quantities with the same dimension. The magnitude of such quantities is independent of the system of units used. A dimensionless quantity is not always a ratio; for instance, the number of people in a room is a dimensionless quantity. Examples include the → Alfven Mach number, → Ekman number, → Froude number, → Mach number, → Prandtl number, → Rayleigh number, → Reynolds number, → Richardson number, → Rossby number, → Toomre parameter. See also → large number. → dimension + -less M.E. from O.E. læs (adv.), læssa (adj.), akin to O.Fr. les "less." |
dimer dimer Fr.: dimère A molecule resulting from combination of two identical molecules. From → di- "two, twice, double," + -mer a combining form denoting member of a particular group, → isomer. |
diode diod (#) Fr.: diode An electronic component with two active terminals, an → anode and a → cathode, through which current passes in one direction (from anode to cathode) and is blocked in the opposite direction. Diodes have many uses, including conversion of → alternating current to → direct current, regulation of votage, and the decoding of audio-frequency signals from radio signals. → di- "two, twice, double," + hodos "way." |
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