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]

The Collaborative International Dictionary of English. 2000.


Look at other dictionaries:

  • umbră — ÚMBRĂ, umbre, s.f. I. 1. Lipsă de lumină, întunecime provocată de un corp opac care opreşte razele de lumină; porţiune din spaţiu întunecoasă (şi răcoroasă) unde nu ajung direct razele de lumină. ♢ loc. adj. Fără umbră = corect, desăvârşit, pur.… …   Dicționar Român

  • Umbra — es un personaje ficticio del universo de Bionicle y representa a un guerrero gigante. Vive en Voya nui y protege la máscara Inika de la vida de los que la emplearían mal. Los grandes seres lo designaron como guardia de la máscara y de la Orden de …   Wikipedia Español

  • Umbra — (lat.: Kernschatten) bezeichnet: Umbra (Farbe), ein Pigment beziehungsweise dessen Farbe bestimmte Gebiete innerhalb von Sonnenflecken, die viel dunkler sind als die Sonnenoberfläche, siehe Penumbra (Astronomie) den Kernschatten bei einer… …   Deutsch Wikipedia

  • UMBRA — an ab imbre, quod omnes Umbrae humidae; an quod imbres obscurant lucem Solis; Perot. et Isidor. an a terra, cuius etiam color dicta Veteribus, humi chroa, χρόα enim Graecis color, post Humbra et Umbra, i. e. Terrae color? Becmann. aer est carens… …   Hofmann J. Lexicon universale

  • umbra — (del lat. «umbra»; ant.) f. *Sombra. * * * umbra. (Del lat. umbra). f. ant. sombra …   Enciclopedia Universal

  • umbra — ȕmbra ž <G mn ȗmbrā> DEFINICIJA 1. min. tamnosmeđa zemljana boja, vrsta okera 2. sjenka ETIMOLOGIJA lat. umbra: sjena …   Hrvatski jezični portal

  • Umbra — Um bra, n.; pl. {Umbr[ae]}. [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 …   The Collaborative International Dictionary of English

  • Umbra — (römische Erde, römische Umbra, Schönrot, Türkischbraun, Umbrabraun, Umbraun), braune Erdfarben, neben als Farbensubstrat anzusehenden Kalk und Tonarten als färbende Hauptbestandteile vorwiegend Eisenoxydhydrat, wenn gelblich, Manganhydrat, wenn… …   Lexikon der gesamten Technik

  • umbra — (n.) 1590s, phantom, ghost, a figurative use from L. umbra shade, shadow (see UMBRAGE (Cf. umbrage)). Astronomical sense of shadow cast by the earth or moon during an eclipse is first recorded 1670s. Meaning an uninvited guest accompanying an… …   Etymology dictionary

  • umbra — (Del lat. umbra). f. ant. sombra …   Diccionario de la lengua española

  • Umbra [1] — Umbra (lat.), 1) der Schatten; 2) ein Tischgenoß bei römischen Gastmählern, welcher nicht von dem Gastgeber eingeladen, sondern von einem Gaste mitgebracht worden war …   Pierer's Universal-Lexikon

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