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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..

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

Asterism :: Asterism (n.) An optical property of some crystals which exhibit a star-shaped by reflected light, as star sapphire, or by transmitted light, as some mica..

Strockle :: Stroboscope (n.) An optical toy similar to the phenakistoscope. See Phenakistoscope.

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

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

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..

Scoptical :: Scoptical (a.) Jesting; jeering; scoffing.

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

Zoetrope :: Zoetrope (n.) An optical toy, in which figures made to revolve on the inside of a cylinder, and viewed through slits in its circumference, appear like a single figure passing through a series of natural motions as if animated or mechanically moved..

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..

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

Dioptra :: Dioptra (n.) An optical instrument, invented by Hipparchus, for taking altitudes, leveling, etc..

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

Define :: Define (v. t.) To determine with precision; to mark out with distinctness; to ascertain or exhibit clearly; as, the defining power of an optical instrument..

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..

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..

Optical :: Optical (a.) Of or pertaining to the eye; ocular; as, the optic nerves (the first pair of cranial nerves) which are distributed to the retina. See Illust. of Brain, and Eye..

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

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