What's the difference between shadow and umbra?

Shadow


Definition:

  • (n.) Shade within defined limits; obscurity or deprivation of light, apparent on a surface, and representing the form of the body which intercepts the rays of light; as, the shadow of a man, of a tree, or of a tower. See the Note under Shade, n., 1.
  • (n.) Darkness; shade; obscurity.
  • (n.) A shaded place; shelter; protection; security.
  • (n.) A reflected image, as in a mirror or in water.
  • (n.) That which follows or attends a person or thing like a shadow; an inseparable companion; hence, an obsequious follower.
  • (n.) A spirit; a ghost; a shade; a phantom.
  • (n.) An imperfect and faint representation; adumbration; indistinct image; dim bodying forth; hence, mystical representation; type.
  • (n.) A small degree; a shade.
  • (n.) An uninvited guest coming with one who is invited.
  • (n.) To cut off light from; to put in shade; to shade; to throw a shadow upon; to overspead with obscurity.
  • (n.) To conceal; to hide; to screen.
  • (n.) To protect; to shelter from danger; to shroud.
  • (n.) To mark with gradations of light or color; to shade.
  • (n.) To represent faintly or imperfectly; to adumbrate; hence, to represent typically.
  • (n.) To cloud; to darken; to cast a gloom over.
  • (n.) To attend as closely as a shadow; to follow and watch closely, especially in a secret or unobserved manner; as, a detective shadows a criminal.

Example Sentences:

  • (1) Findings on plain X-ray of the abdomen, using the usual parameters of psoas and kidney shadows in the Nigerian, indicate that the two communities studied are similar but urinary calculi and urinary tract distortion are significantly more prominent in the community with the higher endemicity of urinary schistosomiasis.
  • (2) One of the most interesting aspects of the shadow cabinet elections, not always readily interpreted because of the bizarre process of alliances of convenience, is whether his colleagues are ready to forgive and forget his long years as Brown's representative on earth.
  • (3) Speaking to pro-market thinktank Reform, Milburn called for “more competition” and said the shadow health team were making a “fundamental political misjudgment” by attempting to roll back policies he had overseen.
  • (4) Shadow education secretary Tristram Hunt said people would see through her attempts to distance herself from Gove.
  • (5) An attempt to eliminate the age effect by adjusting for age differences in monaural shadowing errors, fluid intelligence, and pure-tone hearing loss did not succeed.
  • (6) A ­senior shadow minister, who has not been named by the Telegraph in its exposé of MPs' expenses , was yesterday asked by county councillors not to campaign for next month's local elections.
  • (7) Luciana Berger, Labour shadow secretary for mental health, also expressed alarm.
  • (8) A small band of shadow cabinet members have lined up to refuse to serve in posts they haven’t even been offered, on the basis of objection to economic policies they clearly haven’t read.
  • (9) If two sources of radiation are used, it is decisive to cover with lead the zones of half-shadow on the field limits.
  • (10) The amount of intimidation and abuse that has taken place make it very unlikely that women will be clamouring to go back.” Another former shadow minister said they were also not convinced they would stand again.
  • (11) The risk of "Gesunde Befundträger" (healthy carriers of pulmonary lesions) to develop pulmonary tuberculosis is compared with that of persons with X-ray shadows in the lung.
  • (12) These echoes, however, are not associated with acoustic shadowing.
  • (13) Ed Balls, the shadow home secretary, today called on the head of the Metropolitan police to reopen the investigation into phone hacking by the News of the World.
  • (14) A 43-year-old lady was hospitalized due to easy fatiguability in the legs during exercise, and for evaluation of an abnormal shadow in the chest X-ray, and hypertension.
  • (15) The shadow attorney general, Mark Dreyfus, said Heydon had “got it wrong” in his decision and had “not really approached this as an ordinary, fair-minded person would”.
  • (16) I think it would have been appropriate and right and respectful of people’s feelings to have done so.” There was also confusion over Labour policy sparked by conflicting comments made by Corbyn and his new shadow work and pensions secretary, Owen Smith.
  • (17) He has his job to do and he has to do it the way he thinks best.” On Saturday night, in a sign of the growing concern at the top of the party about the affair, one shadow cabinet member told the Observer : “The issue is already echoing back at us on the doorsteps.” At all levels, there was despair that the furore had turned the spotlight on to Labour’s difficulties as a time when the party had hoped to take advantage of the Tories’ second byelection loss at the hands of Ukip.
  • (18) The first site we explored was a big burial cairn in the shadow of Carn Menyn, where the Stonehenge bluestones come from."
  • (19) There will have to be very direct conversations about his platform,” one shadow cabinet member said, but others have insisted there can be no accommodation with Corbyn’s politics.
  • (20) He is shadow home secretary and will have to defend himself.

Umbra


Definition:

  • (n.) The conical shadow projected from a planet or satellite, on the side opposite to the sun, within which a spectator could see no portion of the sun's disk; -- used in contradistinction from penumbra. See Penumbra.
  • (n.) The central dark portion, or nucleus, of a sun spot.
  • (n.) The fainter part of a sun spot; -- now more commonly called penumbra.
  • (n.) Any one of several species of sciaenoid food fishes of the genus Umbrina, especially the Mediterranean species (U. cirrhosa), which is highly esteemed as a market fish; -- called also ombre, and umbrine.

Example Sentences:

  • (1) If the entire cross-section is blocked, the point will be in the umbra of the shadow; if only a portion of the light is blocked, the point will be in the penumbra of the shadow.
  • (2) The frequency of chromosome aberrations was measured in cultured Umbra limi heart (U1-H) and Chinese hamster ovary (CHO) cells following exposure to the polycyclic aromatic hydrocarbons (PAH) 3,4-benzopyrene (BP), 1,2,5,6-dibenzanthracene (DBA), 1,2-benzanthracene (BA), and pyrene (PY), activated using S9 prepared from rainbow trout liver.
  • (3) While within the penumbra, some direct sunlight falls on the Moon but little darkening of the disc will be noticed until a few minutes before the Moon begins to enter the umbra at 19:23.
  • (4) On that occasion, the Moon traversed the northern part of the umbra and its southern regions, which just missed the shadow's core, are relatively dark.
  • (5) A typical spot has a central dark umbra, surrounded by a lighter penumbra.
  • (6) Due to the very limited amount of knowledge available on the cytochemistry and architecture of fish chromosomes, an extensive banding study was carried out on chromosomes of the central mudminnow, Umbra limi.
  • (7) The mudminnow, Umbra pygmaea, was chosen for this study, because of its ideal karyotype of 22 large chromosomes.
  • (8) Artificial "calculus", consisting of a mixture of shellac, umbra, pumice and plaster dissolved in ethanol, was painted on the root surfaces.
  • (9) The Moon stands over the southern Indian Ocean as it passes through the central dark umbra of the Earth's shadow, plunging deeper into the shadow than during any eclipse since 2000.
  • (10) It was concluded that the chromosomes of Umbra limi displayed typical responses to low level radiation exposure and that this fish would be an ideal cytogenetics model for this study of induced chromosome aberrations in fishes.
  • (11) The Moon's W limb has withdrawn from the umbra by 23:02 and finally exits the penumbra at 00:01.
  • (12) Totality, with the Moon entirely within the umbra, lasts from 20:22 until 22:03 with mid eclipse at 21:13.
  • (13) An in vivo system for the detection of sister chromatid exchange (SCE) in the central mudminnow, Umbra limi, is presented.
  • (14) A parasite of Plica plica in Guyana, previously called P. cnemidophori, is designated P. guyannense, while identification of Plica umbra parasites as P. tropiduri is corrected to P. vacuolatum and Fallisia simplex.
  • (15) The umbra is not illuminated evenly, though, since less of this indirect light penetrates to its core and the amount reaching different zones of the umbra is affected by varying atmospheric conditions.
  • (16) nov. from Plica umbra of Guyana; P. minasense tegui subsp.
  • (17) In the second type, motor activity was observed at any time; this type of periodism was typical of the dogfish Squalus acanthias and the hunchback Sciaena umbra.
  • (18) The central mudminnow, Umbra limi, was chosen fro this study because of its ideal karyotype consisting of 22 large meta- and submetacentric chromosomes.
  • (19) Observers in SE England may just glimpse the end of totality, but most of us may see nothing until it begins to emerge from the umbra.
  • (20) Mudminnows (Umbra pygmaea) and gar (Lepisosteus platyrhincus) were quite tolerant of exposure to acidic waters.

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