haštbar, haštguš (#)
A polygon having eight angles and eight sides.
From L. octagonos, from Gk. oktagononos "eight-angled," from okta-, → octa-, oct- "eight," + gonia "angle," related to gony "knee," L. genu "knee," cuneus "a wedge;" Av. žnu- "knee;" Mod.Pers. zânu "knee," Skt. janu- "knee," kona- "angle, corner;" PIE base *g(e)neu-, see below.
Haštbar "eight-sided," from hašt "eight," → octa-, oct- + bar "side; breadth; breast" (Mid.Pers. var "breast;" Av. vouru "wide, broad, extended" (vourucašāni- "looking far"), related to varah- "breast;" cf. Skt. urú- "wide, broad," úras- "breast;" Gk. eurus "wide, broad;" PIE base uer-, ueru-s"wide, broad"); haštguš, from hašt, → octa-, oct-, + guš "corner, angle," Mid.Pers. gošak "corner."
A geometric solid with eight sides.
The Octant. A faint and obscure constellation, at 21h right ascension, 80° south declination, containing the south celestial pole. Its star Sigma Octantis is the closest naked-eye star to the pole, but it is so faint (magnitude 5.47) that it is practically useless as a polar star for navigation purposes. Abbreviation: Oct; Genitive: Octantis. It was introduced by the French astronomer Nicolas Louis de Lacaille (1713-1762).
Haštakân, → octant.
1) A portion of a circle cut off by an arc and two radii at 45°,
one-eighth of the area of a circle.
Haštakân, from haštak "one-eigth," from hašt "eight" (Mid.Pers. hašt, O.Pers.*aštahva- "eighth;" Av. ašta; cf. Skt. astā; Ossetic ast; (Buddhist) Sogdian 'št; Gk. okto, L. octo (Fr. huit; Sp. ocho); P.Gmc. *akhto(u) (O.E. eahta, æhta, E. eight, O.N. atta, Ger. acht, Goth. ahtau); PIE base *oktô(u) + -ak, contraction of yak "one," (Mid.Pers. êwak (Proto-Iranian *aiua-ka-); O.Pers. aiva- "one, alone;" Av. aēuua- "one, alone" (cf. Skt. éka- "one, alone, single;" Gk. oios "alone, lonely;" L. unus "one;" E. one) + -ân nuance suffix.
The interval between two musical notes, the fundamental components of which have frequencies in the ratio two to one.
M.E., from O.Fr. otaves, from L. octava feminine of octavus, from → octa-, oct- + -avus adj. suffix.
Octâv, loan from Fr. as above.
General: A group or series of eight.
From → oct-, octa- + -et, as in duet.
Haštâyé, from haštâ "eightfold" + (y)é nuance suffix, as in dotâyé, → doublet.
Eightfold; eight times as great.
L. octuplus, from octu- variant (before labials) of → oct- octa- + -plus "fold," from base of plicare "to fold, twist."
Haštâyi, from hašt "eight," → oct- octa- + -tâyi, from tâ "fold, plait, ply; piece, part," also a multiplicative suffix; Mid.Pers. tâg "piece, part."
1) Of, pertaining to, or for the eyes.
From L. ocularis "of the eyes," from oculus "eye," from PIE base *okw- "to see;" cf; Av. aši- "(both) eyes;" E. → eye.
Cašmi, related to cašm "eye" (Mid.Pers. cašm, Av. cašman- "eye," ākas- "to look," from prefix ā- + Proto-Iranian *kas- "to look, appear," cf. Skt. cáksus- "seeing"); didgâni, related to didgân "eyes," plural of didé "eye," from didan "to see" (Mid.Pers. ditan "to see, regard, catch sight of, contemplate, experience;" O.Pers. dī- "to see;" Av. dā(y)- "to see," didāti "sees;" cf. Skt. dhī- "to perceive, think, ponder; thought, reflection, meditation," dādhye; Gk. dedorka "have seen").
Of a number, not divisible by two.
From M.E. odde, from O.N. oddi "odd (number)."
Tâq, related to tak "single, alone", from Mid.Pers. tak, tâg "single, alone," maybe related to tâi, tâ "unit, piece."
Fr.: noyau impair-pair
Nucleus which contains an odd number of protons and an even number of neutrons.
Fr.: noyau impair-impair
Nucleus which contains an odd number of both protons and neutrons.
The science of → wines. Same as enology.
From Gk. oeno-, from oinos cognate with → wine.
Bâdešenâsi, from bâdé, bâda "wine," from Mid.Pers. bâtak "wine," + -šenâsi, → -logy.
The unit of magnitude of magnetic field strength or magnetic intensity in c.g.s. units, i.e. the force in dynes which a unit magnetic pole would experience at any point in a magnetic field.
In honor of Hans Christian Ørsted (1777-1851), the Danish physicist and philosopher, who was the first to notice the interaction of electric current and the magnetic needle (1819) thereby initiating the study of electromagnetism.
Fr.: étoile Of
An → O star whose spectrum displays strong N III 4634-4640-4642 emission and strong He II 4686 emission. The N III lines are always much stronger than C III 4647-4650-4651 when the latter are present. Historically, Of stars were considered to belong to the peculiar category, hence the f notation (see below). In his thesis work, Walborn (1971, ApJS 23, 257) removed them from that category and established them as the normal O-type → supergiants. He also used the notation ((f)), (f), and f to describe the progression from strong He II 4686 absorption, through weakened/absent, to emission, respectively, correlated with increasing N III emission strength, subsequently showing that it is a luminosity sequence -- the first such for stars earlier than O9.
The reason for the Of designation is that the letters Oa-Oe were used in the original Harvard classification to denote various types of → Wolf-Rayet and OB spectra. Therefore Of was the next available when Plaskett and Pearce (1931, Pub. Dominion Ap. Obs 5, 99) wished to distinguish O-type spectra with selective emission in N III 4634-4640-4642 and He II 4686 ("selective" because other lines from the same ions appear in absorption); → star.
Fr.: étoile Of?p
A → massive star spectrum whose principal defining characteristics is the presence of C III 4647, 4650, 4651 emission lines with strength comparable to that of N III 4634, 4640, 4642. This category was introduced by Walborn (1972) to describe two well-known peculiar stars, HD 108 and HD 148937. → Of star
→ Of star; the question mark was intended to denote doubt that these stars are normal Of supergiants; p for "peculiar."
dur az, bar, jodâ, ...
(adverb & preposition) From a place or position; at a distance in space or time. So as to be separated from support.
M.E., from O.E. of "away, away from;" cf. Du. af "off, down," Ger. ab "off, from, down;" PIE *apo- "off, away," → apo-.
Away from a place.
→ off; cognate with Av. and O.Pers. apā "away from, from," as below.
Ap-, from apâ-, from Av. and O.Pers. apā "away from, from;" cf. Skt. apa "away, off;" L. ab- "from, away;" Hittite appa; Gothic af-; Ger. ab-; E. of, as above; PIE base *apo- "off, away"
off-axis optical system
râžmân-e nurik-e ap-âsé
Fr.: système optique hors axe
Of computers, operating independently of, or disconnected from, an associated computer.