penumbra

penumbra
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.

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Look at other dictionaries:

  • penumbra — pe·num·bra /pi nəm brə/ n pl bras 1: an area within which distinction or resolution is difficult or uncertain the public private penumbra 2: an extension of protection, reach, application, or consideration; esp: a body of rights held to be… …   Law dictionary

  • Penumbra — Saltar a navegación, búsqueda Para otros usos de este término, véase Penumbra (desambiguación). Umbra, penumbra, y antumbra La umbra (en latín: sombra ) es la parte más oscura de una …   Wikipedia Español

  • penumbră — PENÚMBRĂ, penumbre, s.f. 1. Zonă incomplet luminată, cuprinsă între zona umbrită şi cea luminoasă din spatele unui corp opac; p. gener, zonă slab luminată; semiobscuritate. 2. (pict.) Zonă de trecere între lumină şi umbră. – Din fr. pénombre. cf …   Dicționar Român

  • Penumbra — (lat. „Halbschatten“) bezeichnet: Penumbra (Astronomie), Gebiete innerhalb von Sonnenflecken, die dunkler als die restliche Sonnenoberfläche sind vereinzelt auch den Halbschatten bei einer Mondfinsternis Penumbra (Medizin), die bei einem… …   Deutsch Wikipedia

  • penumbra — sustantivo femenino 1. (no contable) Sombra débil entre la luz y la oscuridad: La habitación estaba en penumbra. Al entrar, en la penumbra del pub no se veía nada. 2. (no contable) Área: astronomía En los eclipses, zona parcialmente iluminada… …   Diccionario Salamanca de la Lengua Española

  • 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… …   The Collaborative International Dictionary of English

  • penumbra — 1660s, from Mod.L. penumbra partial shadow outside the complete shadow of an eclipse, coined 1604 by Kepler from L. pæne almost + umbra shadow (see UMBRAGE (Cf. umbrage)) …   Etymology dictionary

  • penumbra — s. f. 1.  [Física] Estado de uma superfície incompletamente iluminada por um corpo luminoso cujos raios são em parte interceptados por um corpo opaco. 2.  [Por extensão] Meia luz. 3.  [Belas Artes] Ponto de transição da luz para a sombra.… …   Dicionário da Língua Portuguesa

  • Penumbra — Penumbra, der Halbschatten, der die meisten Sonnenflecke umgibt (s. Sonne) …   Meyers Großes Konversations-Lexikon

  • Penumbra — (lat.), s. Sonnenflecke …   Kleines Konversations-Lexikon

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