1. Throwing light on the body or a part or into a cavity for diagnostic purposes. 2. Lighting an object under a microscope. [L. il-lumino, pp. -atus, to light up]
- axial i. the transmission or reflection of light in the direction of the axis of an optical system. SYN: central i..
- central i. SYN: axial i..
- contact i. i. of the eye by means of an instrument in contact with the cornea or bulbar conjunctiva.
- critical i. the precise focusing of the light source directly upon the object being examined.
- dark-field i. a procedure in which a black circular shield is used to block the majority of the vertically directed rays of light ( e.g., the field is dark), and a circumferential, suitably angled, mirrored surface is used to direct the peripheral rays horizontally against the object, thereby reflecting the light vertically through the objective lens and along the optical axis; thus, the object is well illuminated in a contrasting dark background. SYN: dark-ground i..
- dark-ground i. SYN: dark-field i..
- direct i. an i. in which the rays of light are directed downward, almost perpendicularly onto the upper surface of the object, which reflects the rays upward into the optical system. SYN: erect i., vertical i..
- erect i. SYN: direct i..
- focal i. i. in which a beam of light is directed diagonally to an object so that it is brilliantly illuminated while the surrounding area is in shadow. SYN: lateral i., oblique i..
- Köhler i. a method of i. of microscopic objects in which the image of the light source is focused on the substage condenser diaphragm and the diaphragm of the light source is focused in the same plane with the object to be observed; maximizes both the brightness and uniformity of the illuminated field.
- lateral i. SYN: focal i..
- oblique i. SYN: focal i..
- vertical i. SYN: direct i..

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il·lu·mi·na·tion il-.ü-mə-'nā-shən n
1) the action of supplying or brightening with light or the resulting state
2) the luminous flux per unit area on an intercepting surface at any given point called also illuminance
il·lu·mi·nate il-'ü-mə-.nāt vt, -nat·ed; -nat·ing

* * *

il·lu·mi·na·tion (ĭ-loo″mĭ-naґshən) [L. illuminatio] 1. the lighting up of a part, cavity, organ, or object for inspection. 2. the luminous flux per unit area of a given surface; its SI unit is the lux. Symbol E>.

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  • illumination — [ i(l)lyminasjɔ̃ ] n. f. • 1361; lat. illuminatio I ♦ 1 ♦ Théol. Lumière extraordinaire que Dieu répand dans l âme d un homme. Par l illumination du Saint Esprit. 2 ♦ Cour. Inspiration subite, lumière soudaine qui se fait dans l esprit. ⇒ idée, 1 …   Encyclopédie Universelle

  • Illumination — may refer to:*Illumination (lighting), the use of light sources *Illumination (image), the use of light and shadow in art *Illumination (manuscript), the artistic decoration of hand written texts *Global illumination, algorithms used in computer… …   Wikipedia

  • illumination — Illumination. s. f. v. Action par laquelle on illumine. L illumination de la terre par le soleil. Il n est guere en usage au propre. Il sign. fig. Inspiration. Une illumination divine. par illumination du saint Esprit. C est aussi un terme… …   Dictionnaire de l'Académie française

  • Illumination — Illumination(en) bezeichnet: Illumination (Beleuchtung), das Anstrahlen oder Leuchten Lassen insbesondere von Gebäuden, Sälen, Gärten etc. bei feierlichen Gelegenheiten eine Erleuchtung, metaphorisch die geistige beispielsweise durch eine Idee,… …   Deutsch Wikipedia

  • Illumination — Álbum de Tristania Publicación 30 de Enero, 2007 Grabación Marzo / Abril, 2006 (Woodhouse Studios, Hagen, Alemania) Género(s) Metal gótico …   Wikipedia Español

  • Illumination — Illumination …   Википедия

  • Illumination — Il*lu mi*na tion, n. [L. illuminatio: cf. F. illumination.] 1. The act of illuminating, or supplying with light; the state of being illuminated. [1913 Webster] 2. Festive decoration of houses or buildings with lights. [1913 Webster] 3. Adornment… …   The Collaborative International Dictionary of English

  • Illumination — Sf Beleuchtung, Ausmalung per. Wortschatz fach. (18. Jh.) Entlehnung. Entlehnt aus frz. illumination, dieses aus ml. illūminatio, zu ml. illūmināre erleuchten , zu l. lūmen Licht .    Ebenso nndl. illuminatie, ne. illumination, nschw.… …   Etymologisches Wörterbuch der deutschen sprache

  • illumination — [n1] light; making light beam, brightening, brightness, brilliance, flame, flash, gleam, lighting, lights, radiance, ray; concepts 620,624 Ant. darkness, dimness illumination [n2] clear understanding awareness, clarification, edification,… …   New thesaurus

  • illumination — [i lo͞o΄mə nā′shən] n. [ME illumynacyon < OFr illumination < LL illuminatio] 1. an illuminating or being illuminated; specif., a) a lighting up; supplying of light b) clarification; explanation c) enlightenment; instruction d) decoration… …   English World dictionary

  • Illumination — (v. lat.), eine nächtliche Beleuchtung öffentl. Plätze, Gärten, einzelner Gebäude etc., od. ganzer Städte durch Kerzen od. Lampen, durch Erleuchtung der Fenster, mit Lampen behängte Bogen u. Gerüste, Gemälde, Inschriften etc., brennende… …   Pierer's Universal-Lexikon

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