Definition of Umbra
1. Noun. A region of complete shadow resulting from total obstruction of light.
Definition of Umbra
1. n. 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.
Definition of Umbra
1. Noun. A shadow. ¹
2. Noun. (astronomy) The central region of a sunspot. ¹
¹ Source: wiktionary.com
Definition of Umbra
1. a dark area [n -BRAE or -BRAS] : UMBRAL [adj]
Medical Definition of Umbra
1.
Origin: L, a shadow.
1. 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.
2. 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.
Umbra tree, a tree (Phytolacca diocia) of the same genus as pokeweed. It is native of South America, but is now grown in southern Europe. It has large dark leaves, and a somber aspect. The juice of its berries is used for colouring wine.
Source: Websters Dictionary
(01 Mar 1998)
Lexicographical Neighbors of Umbra
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