Dictionary » U » Umbra



Origin: L, a shadow.

1. (Science: astronomy) 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. (Science: zoology) 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.

(Science: botany) 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.

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