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5 definitions found
 for Umbra
From The Collaborative International Dictionary of English v.0.48 :

  Ombre \Om"bre\, n. [F., of uncertain origin.] (Zool.)
     A large Mediterranean food fish ({Umbrina cirrhosa): --
     called also umbra, and umbrine.
     [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Penumbra \Pe*num"bra\, n. [NL., fr. L. paene almost + umbra
     1. An incomplete or partial shadow.
        [1913 Webster]
     2. (Astron.) The shadow cast, in an eclipse, where the light
        is partly, but not wholly, cut off by the intervening
        body; the space of partial illumination between the umbra,
        or perfect shadow, on all sides, and the full light. --Sir
        I. Newton.
        [1913 Webster]
     Note: The faint shade surrounding the dark central portion of
           a solar spot is also called the penumbra, and
           sometimes umbra.
           [1913 Webster]
     3. (Paint.) The part of a picture where the shade
        imperceptibly blends with the light.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Umbra \Um"bra\, n.; pl. Umbrae. [L., a shadow.]
     1. (Astron.)
        (a) 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
        (b) The central dark portion, or nucleus, of a sun spot.
        (c) The fainter part of a sun spot; -- now more commonly
            called penumbra.
            [1913 Webster]
     2. (Zool.) Any one of several species of sciaenoid food
        fishes of the genus Umbrina, especially the
        Mediterranean species ({Umbrina cirrhosa), which is
        highly esteemed as a market fish; -- called also ombre,
        and umbrine.
        [1913 Webster]
     Umbra+tree+(Bot.),+a+tree+({Phytolacca+dioica">Umbra tree (Bot.), a tree ({Phytolacca dioica) 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
        coloring wine. --J. Smith (Dict. Econ. Plants).
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

      n 1: a region of complete shadow resulting from total
           obstruction of light

From Moby Thesaurus II by Grady Ward, 1.0 :

  21 Moby Thesaurus words for "umbra":
     adumbration, dark shade, eidolon, ghost, gloom, haunt, mere shadow,
     penumbra, phantasm, phantom, revenant, shade, shadiness, shadow,
     shadows numberless, silhouette, skiagram, skiagraph, spook,
     umbrage, umbrageousness

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