umbra


Also found in: Thesaurus, Medical, Legal, Acronyms, Encyclopedia, Wikipedia.
click for a larger image
umbra

um·bra

 (ŭm′brə)
n. pl. um·bras or um·brae (-brē)
1. A dark area, especially the blackest part of a shadow from which all light is cut off.
2. Astronomy
a. The completely dark central portion of the shadow cast by the earth, moon, or other body during an eclipse.
b. The darkest region of a sunspot.

[Latin, shadow.]

um′bral adj.

umbra

(ˈʌmbrə)
n, pl -brae (-briː) or -bras
1. (Astronomy) a region of complete shadow resulting from the total obstruction of light by an opaque object, esp the shadow cast by the moon onto the earth during a solar eclipse
2. (Astronomy) the darker inner region of a sunspot
[C16: from Latin: shade, shadow]
ˈumbral adj

um•bra

(ˈʌm brə)

n., pl. -bras, -brae (-brē).
1. shade; shadow.
2. the usual accompaniment or companion of a person or thing.
3. Astron.
a. the complete or perfect shadow of an opaque body, as a planet, where the direct light from the source of illumination is completely cut off.
b. the dark central portion of a sunspot.
4. a phantom or ghost.
[1590–1600; < Latin: shade, shadow]
um′bral, adj.

um·bra

(ŭm′brə)
1. The darkest part of a shadow, especially the completely dark portion of the shadow cast by Earth, the moon, or another body during an eclipse.
2. The darkest region of a sunspot. Compare penumbra.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.umbra - a region of complete shadow resulting from total obstruction of lightumbra - a region of complete shadow resulting from total obstruction of light
shadow - shade within clear boundaries

umbra

noun
Comparative darkness that results from the blocking of light rays:
Translations

umbra

n pl <-s or -e> (Astron: = shadow) → Kernschatten m; (in sunspot) → Umbra f
References in periodicals archive ?
PS5.99, www.findmeagift.co.uk UMBRA ORCHID JEWELLERY STAND GUNMETAL: An orchid-inspired holder brings an elegant touch to any room, with buds to hang rings from.
A penumbral lunar eclipse occurs when the moon does not fall in the umbra at all and is always present in the penumbra.
[ClickPress, Tue Dec 04 2018] Tamara Umbra has been training for the arrival of doomsday all her life.
Partial eclipse begins : This stage takes hold when the darker, inner part of the Earth's shadow (umbra) begins covering the Moon
At 10.13pm, the total eclipse will end, when the moon will start to leave the Earth's umbra and enter its penumbra, and start to lose its red colour.
Its acquisition will allow Umbra Cuscinetti to acquire new civil programmes, to expand into the defense and nuclear sectors, and to provide aerospace ballscrews, actuators, and electromechanical systems: "Made by Umbragroup in the USA".
More surprisingly, the strongest field was not in the dark part of the umbra, as would be expected, but was actually located at a bright region between two umbrae.
Penumbral shading becomes deeper as the Moon moves toward the first partial phase, which begins when the Moon's leading edge enters Earth's umbra. The umbral shadow cone extends some 1.4 million km (870,000 miles); at the distance of the Moon's orbit, the cone's width is about 9,000 km (5,600 miles).
On Monday, 14 states of the United States are going to be directly under the path of umbra and the lucky ones along this path are going to experience the total solar eclipse.
With tens of thousands of archival and manuscript materials that document the history of African descendant literature and culture--correspondence, pamphlets, screenplays, newspaper clippings, photographs, sheet music, ephemera, including the Penumbra Theatre Company Archives--the Givens Collection is an invaluable community and scholarly resource, and is a key foundation of Umbra Search with the Digital Public Library of America corpus providing over half of the content found in Umbra Search.
The umbra is a central cone of darkness that tapers away from Earth while the penumbra is much lighter and spreads out from the edges of the umbra.
'The lunar surface is not completely shadowed by the Earth's umbra (darkest part of a shadow).