a region of complete shadow resulting from total obstruction of light
The central region of a sunspot.
Origin: From umbra.
the conical shadow projected from a planet or satellite, on the side opposite to the sun, within which a spectator could see no portion of the sun's disk; -- used in contradistinction from penumbra. See Penumbra
the central dark portion, or nucleus, of a sun spot
the fainter part of a sun spot; -- now more commonly called penumbra
any one of several species of sciaenoid food fishes of the genus Umbrina, especially the Mediterranean species (U. cirrhosa), which is highly esteemed as a market fish; -- called also ombre, and umbrine
The umbra, penumbra and antumbra are the names given to three distinct parts of a shadow, created by any light source after impinging on an opaque object. For a point source only the umbra is cast. These names are most often used to refer to the shadows cast by celestial bodies, though they are sometimes used to describe levels of darkness, such as in sunspots.
Chambers 20th Century Dictionary
um′bra, n. a shadow: (astron.) the dark cone projected from a planet or satellite on the side opposite to the sun: an uninvited guest whom an invited one brings with him: one of the Umbridæ, the mud-minnows: a sciænoid fish, the umbrine.—adjs. Um′bral, pertaining to an umbra; Um′brāted (her.), shadowed; (obs.) Umbrat′ic, -al, Um′bratile, shadowy, secluded.—ns. Umbrā′tion, adumbration; Um′brere, Um′briere (Spens.), the visor of a helmet.—adj. Umbrif′erous, casting a shade. [L.]
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The numerical value of umbra in Chaldean Numerology is: 6
The numerical value of umbra in Pythagorean Numerology is: 1
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