umbra

umbra

um·bra

U0015400 (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 -bras1. (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 eclipse2. (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.

Thesaurus

Noun

umbra - a region of complete shadow resulting from total obstruction of lightshadow - shade within clear boundaries

umbra

nounComparative darkness that results from the blocking of light rays:penumbra, shade, shadow, umbrage.

Translations

ombra

umbra

umbra:

see eclipseeclipse
[Gr.,=failing], in astronomy, partial or total obscuring of one celestial body by the shadow of another. Best known are the lunar eclipses, which occur when the earth blocks the sun's light from the moon, and solar eclipses, occurring when the moon blocks the sun's light
..... Click the link for more information. ; sunspotssunspots,
dark, usually irregularly shaped spots on the sun's surface that are actually solar magnetic storms. The spots are darker because the temperature of the spots is lower than that of the surrounding photosphere (the visible surface of the sun).
..... Click the link for more information. .

Umbral and penumbral regions of a shadow

umbra

(um -bră) 1. The dark inner region of a shadow cast by an object illuminated by a light of finite size rather than a pinpoint of light. The less dark outer region of the shadow is the penumbra (see illustration). The source of light is totally obscured to someone in the umbral region but only partly obscured in the penumbral region. See eclipse. 2. See sunspots.

umbra

[′əm·brə] (astronomy) The dark, central region of a sunspot. (optics) That portion of a shadow which is screened from light rays emanating from any part of an extended source.

umbra

1. 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. the darker inner region of a sunspot

umbra

[um´brah] the part of a shadow in which there is no light from any light source.a sharp appearance to the edges of a structure on a radiograph.

um·bra

(ŭm'bră) radiology An image with sharply defined margins.

umbra

(ŭm′bră) [L., shade, shadow] The edge of the radiographic image proper.

penumbra

1. Region of very low illumination on a dark background. 2. Zone in which the brightness varies from some illumination to zero (umbra) in the shadow cast by an opaque object intercepting light from an extensive light source. See shadow.

Acronym

Definition

UMBRA➣Upper Mississippi River Basin Association

UMBRA➣[not an acronym] US Codeword for high grade SIGINT

umbra

um·bra

umbra

um•bra

um·bra

umbra

umbra

umbra:

umbra

umbra

umbra

umbra

umbra

um·bra

umbra

penumbra

UMBRA

umbra

Synonyms for umbra

noun comparative darkness that results from the blocking of light rays

Synonyms

Words related to umbra

noun a region of complete shadow resulting from total obstruction of light

Related Words