The study of the ocean, embracing and integrating all knowledge pertaining to the ocean's physical boundaries, the chemistry and physics of sea water, and marine biology.
M.E. oker, O.Fr. ocre, from L. ochra, from Gk. okhra, from okhros "pale yellow."
Oxrâ, loan from Gk.
ostare-ye Ockham (#)
Fr.: rasoir d'Ockham
The notion that any hypothesis should be stripped of all unnecessary assumptions. If two hypotheses fit the observations equally well, the one that makes the fewest assumptions should be chosen.
The doctrine was formulated by William of Ockham (c.1288-c.1347), an English Franciscan friar and scholastic philosopher. Razor from O.Fr. rasour "a razor," from raser "to scrape, shave."
Ostaré "razor," from sotordan "to shave, erase, remove;" Mid.Pers. ôstarak "removed, shaved," ôstârišn "wiping, shaving;" cf. Khotanese ustar- "to remove," Sogdian (prefixed *pari-) prtr- "to wipe off, dry up," from Proto-Iranian *us-tar- "to remove, wipe off."
hašt-, octa-, oct-
Fr.: octa-, octo-, oct-
A prefix meaning eight.
From L. octo, Gk. okto, cognate with Pers. hašt, as below. Skt. asta, Goth. ahtau, O.E. eahta (see eight).
Hašt "eight," from 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).
A group of eight units or figures.
From Gk. oktad- (stem oktás) "group of eight," from okt-→ oct- + -ad a prefix denoting a group or unit comprising a certain number, sometimes of years (e.g. dyad; triad).
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.