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Aperture :: Aperture (n.) The diameter of the exposed part of the object glass of a telescope or other optical instrument; as, a telescope of four-inch aperture..

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..

Eyepiece :: Eyepiece (n.) The lens, or combination of lenses, at the eye end of a telescope or other optical instrument, through which the image formed by the mirror or object glass is viewed..

Autoptical :: Autoptical (a.) Seen with one's own eyes; belonging to, or connected with, personal observation; as, autoptic testimony or experience..

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..

Stop :: Stop (n.) The diaphragm used in optical instruments to cut off the marginal portions of a beam of light passing through lenses.

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

Perspicil :: Perspicil (n.) An optical glass; a telescope.

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

Power :: Power (n.) The degree to which a lens, mirror, or any optical instrument, magnifies; in the telescope, and usually in the microscope, the number of times it multiplies, or augments, the apparent diameter of an object; sometimes, in microscopes, the number of times it multiplies the apparent surface..

Optical :: Optical (a.) Relating to the science of optics; as, optical works..

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..

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

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..

Glass :: Glass (v. t.) An optical glass; a lens; a spyglass; -- in the plural, spectacles; as, a pair of glasses; he wears glasses..

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

Graphoscope :: Graphoscope (n.) An optical instrument for magnifying engravings, photographs, etc., usually having one large lens and two smaller ones..

Phantasm :: Phantasm (n.) An image formed by the mind, and supposed to be real or material; a shadowy or airy appearance; sometimes, an optical illusion; a phantom; a dream..

Autoptically :: Autoptically (adv.) By means of ocular view, or one's own observation..

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

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