Umbra
from
The Collaborative International Dictionary of English v.0.48
Penumbra \Pe*num"bra\, n. [NL., fr. L. paene almost + umbra
shade.]
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
{Penumbra}.
(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}) 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
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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