Visual Vis"u*al, a. [L. visualis, from visus a seeing, sight: cf. F. visuel. See {Vision}.] 1. Of or pertaining to sight; used in sight; serving as the instrument of seeing; as, the visual nerve. [1913 Webster]

The air, Nowhere so clear, sharpened his visual ray. --Milton. [1913 Webster]

2. That can be seen; visible. [R.] [1913 Webster]

{Visual angle}. (Opt.) See under {Angle}.

{Visual cone} (Persp.), a cone whose vertex is at the point of sight, or the eye.

{Visual plane}, any plane passing through the point of sight.

{Visual point}, the point at which the visual rays unite; the position of the eye.

{Visual purple} (Physiol.), a photochemical substance, of a purplish red color, contained in the retina of human eyes and in the eyes of most animals. It is quickly bleached by light, passing through the colors, red, orange, and yellow, and then disappearing. Also called {rhodopsin}, and {vision purple}. See {Optography}.

{Visual ray}, a line from the eye, or point of sight.

{Visual white} (Physiol.), the final product in the action of light on visual purple. It is reconverted into visual purple by the regenerating action of the choroidal epithelium.

{Visual yellow} (Physiol.), a product intermediate between visual purple and visual white, formed in the photochemical action of light on visual purple. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Rhodopsin — Rhodopsin, also known as visual purple, is a pigment of the retina that is responsible for both the formation of the photoreceptor cells and the first events in the perception of light. Rhodopsins belong to the G protein coupled receptor family… …   Wikipedia

  • Rhodopsin — Dreidimensionales Strukturmodell des Backbones von Rhodopsin. In der …   Deutsch Wikipedia

  • Rhodopsin — Rho*dop sin, n. [Gr. ro don rose + w ps eye.] (Physiol.) The visual purple. See under {Visual}. [1913 Webster] …   The Collaborative International Dictionary of English

  • rhodopsin — rhodopsin. См. родопсин. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • Rhodopsin — Rhodopsīn, s. Sehpurpur …   Kleines Konversations-Lexikon

  • Rhodopsin — Rhodopsin, Sehpurpur, in den Stäbchen der Wirbeltiere und in den Lichtsinneszellen verschiedener Wirbelloser nachgewiesener ⇒ Sehfarbstoff. R. ist ein Chromoprotein, das aus dem Protein Opsin und dem Aldehyd des Retinols, dem Retinal, besteht.… …   Deutsch wörterbuch der biologie

  • Rhodopsin — vgl. Sehpurpur …   Das Wörterbuch medizinischer Fachausdrücke

  • rhodopsin — [rō däp′sin] n. [< Gr rhodon, a rose (see RHODA) + opsis, sight (see OPSIS) + IN1] a purplish, photosensitive protein pigment that is essential for vision in dim light, found in the rods of the retina: also called visual purple: see OPSIN …   English World dictionary

  • rhodopsin — /roh dop sin/, n. Biochem. a bright red photosensitive pigment found in the rod shaped cells of the retina of certain fishes and most higher vertebrates: it is broken down by the action of dim light into retinal and opsin. Also called visual… …   Universalium

  • Rhodopsin — Rho|d|op|sin [↑ rhod u. ↑ Opsin], das; s, e; Syn.: Sehpurpur: ein tiefrotes lichtempfindliches Chromoprotein (MG 28 600) mit 348 Aminosäuren) mit 11 cis Retinal als prosthetischer Gruppe, die nach Art einer Schiff Base an einen Lysinrest des… …   Universal-Lexikon

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