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Ganoidei :: Ganoidei (n. pl.) One of the subclasses of fishes. They have an arterial cone and bulb, spiral intestinal valve, and the optic nerves united by a chiasma. Many of the species are covered with bony plates, or with ganoid scales; others have cycloid scales..

Vision :: Vision (v.) The faculty of seeing; sight; one of the five senses, by which colors and the physical qualities of external objects are appreciated as a result of the stimulating action of light on the sensitive retina, an expansion of the optic nerve..

Inactose :: Inactose (n.) A variety of sugar, found in certain plants. It is optically inactive..

Chromatrope :: Chromatrope (n.) A device in a magic lantern or stereopticon to produce kaleidoscopic effects.

Erector :: Erector (n.) An attachment to a microscope, telescope, or other optical instrument, for making the image erect instead of inverted..

Periscope :: Periscope (n.) an optical instrument of tubular shape containing an arrangement of lenses and mirrors (or prisms), allowing a person to observe a field of view otherwise obstructed, as beyond an obstructing object or (as in submarines) above the surface of the water..

Telescope :: Telescope (n.) An optical instrument used in viewing distant objects, as the heavenly bodies..

Scoptic :: Scoptic (a.) Alt. of Scoptica.

Illuminator :: Illuminator (v. t.) A condenser or reflector of light in optical apparatus; also, an illuminant..

Microscope :: Microscope (n.) An optical instrument, consisting of a lens, or combination of lenses, for making an enlarged image of an object which is too minute to be viewed by the naked eye..

Ocular :: Ocular (n.) The eyepiece of an optical instrument, as of a telescope or microscope..

Autopsical :: Autopsical (a.) Pertaining to autopsy; autoptical.

Synoptist :: Synoptic (n.) One of the first three Gospels of the New Testament. See Synoptist.

Retina :: Retina (n.) The delicate membrane by which the back part of the globe of the eye is lined, and in which the fibers of the optic nerve terminate. See Eye..

Chromatics :: Chromatics (n.) The science of colors; that part of optics which treats of the properties of colors.

Abba :: Abba (n.) Father; religious superior; -- in the Syriac, Coptic, and Ethiopic churches, a title given to the bishops, and by the bishops to the patriarch..

Lens :: Lens (n.) A piece of glass, or other transparent substance, ground with two opposite regular surfaces, either both curved, or one curved and the other plane, and commonly used, either singly or combined, in optical instruments, for changing the direction of rays of light, and thus magnifying objects, or otherwise modifying vision. In practice, the curved surfaces are usually spherical, though rarely cylindrical, or of some other figure..

Optic :: Optic (a.) The organ of sight; an eye.

Haikal :: Haikal (n.) The central chapel of the three forming the sanctuary of a Coptic church. It contains the high altar, and is usually closed by an embroidered curtain..

Mirage :: Mirage (n.) An optical effect, sometimes seen on the ocean, but more frequently in deserts, due to total reflection of light at the surface common to two strata of air differently heated. The reflected image is seen, commonly in an inverted position, while the real object may or may not be in sight. When the surface is horizontal, and below the eye, the appearance is that of a sheet of water in which the object is seen reflected; when the reflecting surface is above the eye, the image is seen pr

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