Umbra Definition

ŭmbrə
umbrae, umbras
noun
Shade or a shadow.
Webster's New World
The dark central cone of shadow projecting from a planet or satellite on the side opposite the sun.
Webster's New World
A perfect or complete shadow, in which no direct light is received from the source of illumination.
Webster's New World
The dark central part of a sunspot.
Webster's New World
A phantom, or ghost.
Webster's New World
Synonyms:

Other Word Forms of Umbra

Noun

Singular:
umbra
Plural:
umbrae, umbras

Origin of Umbra

  • From Latin umbra (“shadow").

    From Wiktionary

  • Latin shadow

    From American Heritage Dictionary of the English Language, 5th Edition

Umbra Sentence Examples

  • The notions of the penumbra and umbra are important in considering eclipses (q.v.).

  • The umbra in the former case becomes the fully illuminated portion, and vice versa.

  • Each spot shows with more or less completeness a ring-shaped penumbra enclosing a darker umbra; the umbra, which looks black beside' the photosphere, is actually about as brilliant as limelight.

  • In a partial lunar eclipse, it partly enters the umbra and only part of its surface is darkened.

  • When the slit of the spectroscope is set across a spot, it shows, as might be expected, a general reduction of brightness as we pass from the photosphere to the penumbra; and a still greater one as we pass to the umbra.

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Words Starting With

UUMUMB

Words Ending With

ARABRA

Unscrambles

umbra

Words Starting With U and Ending With A

Starts With U & Ends With AStarts With UM & Ends With AStarts With U & Ends With RA

Word Length

5 Letter Words5 Letter Words Starting With U5 Letter Words Ending With A