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1) A regular or repetitive form, order, or arrangement; a
distinctive form. → diffraction pattern;
→ interference pattern.
M.E. patron, from O.Fr. patron, from M.L. patronus "patron saint, lord, master, model, pattern," from pater "father."
Olgu "pattern," from Turkish ülgü "form, mold, model."
Fr.: vitesse de rotation de l'onde spirale ou barrée
In models of → galactic structure, the → angular velocity of a → spiral arm or a → bar, assumed to be a pattern rotating as a solid body in the galaxy. Pattern speed, ΩP , is one of the most important parameters of the → density wave theory responsible for the spiral arms. Pattern speed determines the location of the → corotation resonance.
Pauli exclusion principle
parvaz-e sokolân-e Pauli
Fr.: principe d'exclusion de Pauli
From L. pavo "peacock;" paupulo "peacock's sound;" Gk. taos "peacock;"
Tâvus, from Ar., ultimately from Gk. taos "peacock."
The round edible seed of a widely cultivated plant, Pisum sativum, of the legume family.
False singular from M.E. pease (plural pesen), from O.E. pise (West Saxon), piose (Mercian) "pea," from L.L. pisa, variant of L. pisum "pea," from Gk. pison "the pea."
Noxod "pea," from Mid.Pers. naxôd, naxvat "pea."
1) The normal, non warring condition of a nation, group of nations, or the world.
From M.E. pes, pais, pees, from Anglo-Norman peis, pes, from O.Fr. pais "peace, reconciliation, silence," from L. pacem (nominative pax) "compact, agreement, treaty of peace, tranquility," ultimately from PIE root *pag- "to fasten."
Râman, related to râmeš "tranquility, rest," ârâm "quiet, peaceful," ârâmidan "to become calm, calmed, rest," Mid.Pers. râm "peace," râmenidan "to give peace, pleasure," râmišn "peace, pleasure;" Av. ram- "to stay, rest;" cf. Skt. ram- "to stop, stand still, rest, become appeased;" Gk. erema "quietly, gently;" Goth. rimis "rest;" Lith. rāmas "rest." + suufix -an.
Perhaps from M.L.G. pék "pick, pike."
Setiq "summit, top," from *us-tig, from us-, → ex-, + tig "pointed," related to tiq "blade," tiz "sharp," tež, tej, tij; Mid.Pers. tigr, têz, têž "sharp," O.Pers. tigra- "pointed," tigra.xauda- "pointed helmet (epithet of Scythians)," Av. tiγra- "pointed," tiγray- "arrow," tiži.arštay- "with the pointed spear," cf. Skt. tikta- "sharp, pungent, bitter," tejas- "sharpness, edge, point or top of a flame;" PIE base *st(e)ig- "to stick; pointed." Cognates in other IE languages: Gk. stizein "to prick, puncture," stigma "mark made by a pointed instrument," L. in-stigare "to goad," O.H.G. stehhan, Ger. stechen "to stab, prick," Du. stecken, O.E. sticca "rod, twig, spoon," E. stick.
Fr.: luminosité du pic
The → bolometric luminosity of a → supernova corresponding to the highest brightness in its → light curve. The peak luminosity occurs after the → supernova explosion; it is directly linked to the amount of radioactive 56Ni produced in the explosion and can be used to test various explosion models. Following → Arnett's rule, one can derive the 56Ni mass from the peak luminosity of a → Type Ia supernova.
Fr.: longueur d'onde pic
The wavelength at which the radiant intensity of a source is maximum.
Fr.: cacahuète, arachide
The pod or the enclosed edible seed of the plant, Arachis hypogaea, of the legume family: the pod is forced underground in growing, where it ripens (Dictionary.com). → box-peanut bulge.
A secretion consisting mainly of calcium carbonate, CaCO3, produced by various mollusks.
M.E. perle, from O.Fr. perle, M.L. perla of unknown origin.
Morvârid "pearl;" Mid.Pers. murwârid, murgârid; cf. Sogd. marγārit, marrγārt; Khotanese mrāhe. Gk. margarites "pearl" may be a loanword from Iranian.
A partially carbonized vegetable matter, usually mosses, found in bogs and used as fertilizer and fuel.
M.E. pete, of unknown origin.
Turb, from Fr. tourbe, from Germanic turba; cf. O.Fris. turf, O.H.G. zurba, Ger. Torf, O.E. turf, tyrf "slab of soil and grass," E. turf.
From L. peculiaris "of one's own (property)," from peculium "private property," from pecu "flock, farm animals, cattle," pecunia "money, property;" cf. Av. pasu-, fšu- "sheep;" Mid.Pers. pâh, pasvīk "cattle;" Mid./Mod.Pers. šu/ša in šupân/šabân "cattle keeper, shepherd;" Pers. dialects Laki and Tâti pas "sheep;" Skt. paśu- "cattle;" Goth. faihu "money, fortune;" O.E. feoh "cattle, money;" Ger. Vieh "cattle;" Lith. pekus "cattle;" PIE base *peku- "cattle."
Afd "peculiar; strange" (Dehxodâ), from Mid.Pers. afd, awd "peculiar, strange."
Fr.: galaxie particulière
An irregular galaxy that has an abnormal shape (neither elliptical, spiral, nor lenticular) and/or has another unusual characteristic.
Fr.: mouvement particulier
1) The true motion of a star with respect to the Local Standard
of Rest. → proper motion.
Fr.: étoile particulière
A star with a spectrum that cannot be conveniently fitted into any of the standard → spectral classifications.
Fr.: vitesse particulière
1) Velocity with respect to the Local Standard of Rest.
The quality or condition of being peculiar.
Noun form of → peculiar.
Pegâsus (#), asb-e bâldâr (#)
The Winged Horse. A large constellation in the northern hemisphere at 22h 50m right ascension, 20° north declination. The stars → Markab, → Scheat, and → Algenib form three corners of the famous Great → Square of Pegasus, which is completed by the star → Alpheratz from neighboring → Andromeda. Abbreviation: Peg; Genitive: Pegasi.
In Gk. mythology, Pegasus is the winged horse that was fathered by Poseidon with Medusa. When the head of Medusa was cut off by Perseus, the horse sprang forth from her pregnant body. Pegasus aided Perseus in his fight against both the Chimera and the Amazons.
Pegâsus, from Gk., as above; asb-e bâldâr "Winged Horse," referring to the Gk. mythology, from asb→ horse; bâl, → wing; dâr "having, possessor" (from dâštan "to have, to possess," Mid.Pers. dâštan, O.Pers./Av. root dar- "to hold, keep back, maintain, keep in mind," Skt. dhr-, dharma- "law," Gk. thronos "elevated seat, throne," L. firmus "firm, stable," Lith. daryti "to make," PIE *dher- "to hold, support").
To make worse; to cause to deteriorate. To endow (a word) with a less favorable meaning.
Back formation from → pejorative.