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Optical :: Optical (a.) Of or pertaining to vision or sight.

Optician :: Optician (a.) One who deals in optical glasses and instruments.

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..

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

Field :: Field (n.) The space covered by an optical instrument at one view.

Phoneidoscope :: Phoneidoscope (n.) An instrument for studying the motions of sounding bodies by optical means. It consists of a tube across the end of which is stretched a film of soap solution thin enough to give colored bands, the form and position of which are affected by sonorous vibrations..

Perspectively :: Perspectively (adv.) Optically; as through a glass.

Sextant :: Sextant (n.) An instrument for measuring angular distances between objects, -- used esp. at sea, for ascertaining the latitude and longitude. It is constructed on the same optical principle as Hadley's quadrant, but usually of metal, with a nicer graduation, telescopic sight, and its arc the sixth, and sometimes the third, part of a circle. See Quadrant..

Anorthoscope :: Anorthoscope (n.) An optical toy for producing amusing figures or pictures by means of two revolving disks, on one of which distorted figures are painted..

Phantasmagoria :: Phantasmagoria (n.) An optical effect produced by a magic lantern. The figures are painted in transparent colors, and all the rest of the glass is opaque black. The screen is between the spectators and the instrument, and the figures are often made to appear as in motion, or to merge into one another..

Flint Glass :: Flint glass () A soft, heavy, brilliant glass, consisting essentially of a silicate of lead and potassium. It is used for tableware, and for optical instruments, as prisms, its density giving a high degree of dispersive power; -- so called, because formerly the silica was obtained from pulverized flints. Called also crystal glass. Cf. Glass..

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..

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

Phantascope :: Phantascope (n.) An optical instrument or toy, resembling the phenakistoscope, and illustrating the same principle; -- called also phantasmascope..

Spectroscope :: Spectroscope (n.) An optical instrument for forming and examining spectra (as that of solar light, or those produced by flames in which different substances are volatilized), so as to determine, from the position of the spectral lines, the composition of the substance..

Thaumatrope :: Thaumatrope (n.) An optical instrument or toy for showing the presistence of an impression upon the eyes after the luminous object is withdrawn.

Definition :: Definition (n.) Distinctness or clearness, as of an image formed by an optical instrument; precision in detail..

Spectacle :: Spectacle (n.) An optical instrument consisting of two lenses set in a light frame, and worn to assist sight, to obviate some defect in the organs of vision, or to shield the eyes from bright light..

Enorthotrope :: Enorthotrope (n.) An optical toy; a card on which confused or imperfect figures are drawn, but which form to the eye regular figures when the card is rapidly revolved. See Thaumatrope..

Anisotropic :: Anisotropic (a.) Not isotropic; having different properties in different directions; thus, crystals of the isometric system are optically isotropic, but all other crystals are anisotropic..

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