umbra

[ uhm-bruh ]

/ ˈʌm brə /

SEE SYNONYMS FOR umbra ON THESAURUS.COM

noun, plural um·bras, um·brae [uhm-bree]. /ˈʌm bri/.

shade; shadow.

the invariable or characteristic accompaniment or companion of a person or thing.

Astronomy.

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.Compare penumbra (def. 1a).
the dark central portion of a sunspot.Compare penumbra (def. 1b).

a phantom or shadowy apparition, as of someone or something not physically present; ghost; spectral image.

Origin of umbra

1600–10; from Latin: literally, “shade, shadow”

OTHER WORDS FROM umbra

umbral, adjective

Words nearby umbra

umble pie, umbles, umbo, umbonal, umbonate, umbra, umbrage, umbrageous, umbrella, umbrella bird, umbrella leaf

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for umbra

From the fact that the spectrum is darkened we learn that there is considerable general absorption of light in the umbra.
The Story of the Heavens|Robert Stawell Ball
The double of the Egyptian sepulchral records corresponds exactly to the of the Greeks and the umbra of the Latins.
A history of art in ancient Egypt, Vol. I (of 2)|Georges Perrot
Sed nos veri iuris germanaeque iustitiae solidam et expressam effigiem nullam tenemus, umbra et imaginibus utimur.
De Officiis|Marcus Tullius Cicero
Within the umbra there is sometimes seen a still darker spot, called the nucleus.
The Astronomy of Milton's 'Paradise Lost'|Thomas Orchard

Each spot is quite sharply divided into an umbra and a penumbra.
Astronomy for Young Folks|Isabel Martin Lewis

British Dictionary definitions for umbra

umbra

/ (ˈʌmbrə) /

noun plural -brae (-briː) or -bras

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

the darker inner region of a sunspot

Compare penumbra

Derived forms of umbra

umbral, adjective

Word Origin for umbra

C16: from Latin: shade, shadow

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for umbra

umbra

[ ŭm′brə ]

Plural umbras umbrae (ŭm′brē)

The darkest part of a shadow, especially the cone-shaped region of full shadow cast by Earth, the Moon, or another body during an eclipse. In a full lunar eclipse, which generally lasts for one or two hours, the entire disk of the Moon is darkened as it passes through the umbra. During this period the Moon takes on a faint reddish glow due to illumination by a small amount of sunlight that is refracted through the Earth's atmosphere and bent toward the darkened Moon; the reddish tint is caused by the filtering out of blue wavelengths as the sunlight passes through the Earth's atmosphere, leaving only the longer wavelengths on the red end of the spectrum. See Note at eclipse.

The dark central region of a sunspot. Compare penumbra.

单词	umbra
释义	umbra [ uhm-bruh ] / ˈʌm brə / SEE SYNONYMS FOR umbra ON THESAURUS.COM noun, plural um·bras, um·brae [uhm-bree]. /ˈʌm bri/. shade; shadow. the invariable or characteristic accompaniment or companion of a person or thing. Astronomy. 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.Compare penumbra (def. 1a). the dark central portion of a sunspot.Compare penumbra (def. 1b). a phantom or shadowy apparition, as of someone or something not physically present; ghost; spectral image. Origin of umbra 1600–10; from Latin: literally, “shade, shadow” OTHER WORDS FROM umbra umbral, adjective Words nearby umbra umble pie, umbles, umbo, umbonal, umbonate, umbra, umbrage, umbrageous, umbrella, umbrella bird, umbrella leaf Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for umbra From the fact that the spectrum is darkened we learn that there is considerable general absorption of light in the umbra. The Story of the Heavens\|Robert Stawell Ball The double of the Egyptian sepulchral records corresponds exactly to the of the Greeks and the umbra of the Latins. A history of art in ancient Egypt, Vol. I (of 2)\|Georges Perrot Sed nos veri iuris germanaeque iustitiae solidam et expressam effigiem nullam tenemus, umbra et imaginibus utimur. De Officiis\|Marcus Tullius Cicero Within the umbra there is sometimes seen a still darker spot, called the nucleus. The Astronomy of Milton's 'Paradise Lost'\|Thomas Orchard Each spot is quite sharply divided into an umbra and a penumbra. Astronomy for Young Folks\|Isabel Martin Lewis British Dictionary definitions for umbra umbra / (ˈʌmbrə) / noun plural -brae (-briː) or -bras 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 the darker inner region of a sunspot Compare penumbra Derived forms of umbra umbral, adjective Word Origin for umbra C16: from Latin: shade, shadow Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Words related to umbra shadow, dark, gloom, obscurity, shade, body, ghost, woman, human being, character, person, individual, creature, spirit, man, soul, vision, darkness, dusk, screen Scientific definitions for umbra umbra [ ŭm′brə ] Plural umbras umbrae (ŭm′brē) The darkest part of a shadow, especially the cone-shaped region of full shadow cast by Earth, the Moon, or another body during an eclipse. In a full lunar eclipse, which generally lasts for one or two hours, the entire disk of the Moon is darkened as it passes through the umbra. During this period the Moon takes on a faint reddish glow due to illumination by a small amount of sunlight that is refracted through the Earth's atmosphere and bent toward the darkened Moon; the reddish tint is caused by the filtering out of blue wavelengths as the sunlight passes through the Earth's atmosphere, leaving only the longer wavelengths on the red end of the spectrum. See Note at eclipse. The dark central region of a sunspot. Compare penumbra. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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umbra

noun, plural um·bras, um·brae [uhm-bree]. /ˈʌm bri/.

Origin of umbra

OTHER WORDS FROM umbra

Words nearby umbra

Example sentences from the Web for umbra

British Dictionary definitions for umbra

noun plural -brae (-briː) or -bras

Derived forms of umbra

Word Origin for umbra

Words related to umbra

Scientific definitions for umbra

Plural umbras umbrae (ŭm′brē)