umbra

noun

um·​bra ˈəm-brə How to pronounce umbra (audio)
plural umbras or umbrae ˈəm-(ˌ)brē How to pronounce umbra (audio)
-ˌbrī
1
a
: a conical shadow excluding all light from a given source
specifically : the conical part of the shadow of a celestial body excluding all light from the primary source
b
: the central dark part of a sunspot
2
: a shaded area
umbral adjective

Did you know?

The Latin word umbra ("shade, shadow") has given English a range of words in addition to umbra itself. An umbrella can provide us with shade from the sun. So can an umbrageous tree. (In this case, umbrageous means "affording shade.") The connection to shade or shadow in other umbra words is less obvious. When we say someone takes umbrage, we mean they take offense, but in times past people used the word as a synonym of shade or shadow. These two senses of umbrage influenced umbrageous, which can mean "inclined to take offense easily" as well as "affording shade."

Examples of umbra in a Sentence

strange noises were coming from the wooded umbra beyond our campfire during a solar eclipse observers located within the umbra experience a complete blocking of the sun by the moon
Recent Examples on the Web The moon's shadow seen on Earth today, called the umbra, travels at more than 1,500 miles per hour, according to NASA. Sarah Maddox, CBS News, 9 Apr. 2024 The first jet will then break off to the Northeast as the eclipse approaches and will try to lock its camera onto the 118-mile-wide umbra. Maura Barrett, NBC News, 8 Apr. 2024 These localities will be located directly in the umbra of the eclipse and, therefore, their inhabitants will perceive it as total. Geraldine Castro, WIRED, 6 Apr. 2024 Ideally, your goal should be to stand beneath the Moon’s darker, inner shadow — the umbra. Michael E. Bakich, Discover Magazine, 22 Jan. 2024 According to National Geographic, a solar eclipse occurs when the moon passes between the sun and Earth, creating a shadow on our planet called an umbra. Marina Johnson, The Courier-Journal, 1 Apr. 2024 When the moon moves into the inner part of Earth's shadow, or umbra, according to NASA, some of the sunlight entering Earth's skies scatters before reaching the moon's surface. The Indianapolis Star, 6 Mar. 2024 Mexican Central Daylight Time, the umbra arrives at Nazas. Michael E. Bakich, Discover Magazine, 4 Mar. 2024 This full moon is also a partial lunar eclipse, according to the experts at NASA, an imperfect alignment of the sun, Earth and moon that results in the moon passing through only part of Earth's umbra. The Indianapolis Star, 6 Mar. 2024

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'umbra.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

Etymology

Latin

First Known Use

1638, in the meaning defined at sense 2

Time Traveler
The first known use of umbra was in 1638

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Dictionary Entries Near umbra

Cite this Entry

“Umbra.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/umbra. Accessed 18 Apr. 2024.

Kids Definition

umbra

noun
um·​bra ˈəm-brə How to pronounce umbra (audio)
plural umbras or umbrae -brē How to pronounce umbra (audio)
-ˌbrī
1
: a shaded area
2
: the cone-shaped part of the shadow of a celestial body from which the light of the sun is completely blocked

More from Merriam-Webster on umbra

Last Updated: - Updated example sentences
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