Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of optical is as below...

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..

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.

Megalethoscope :: Megalethoscope (n.) An optical apparatus in which pictures are viewed through a large lens with stereoptical effects. It is often combined with the stereoscope.

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

Optically :: Optically (adv.) By optics or sight; with reference to optics.

Chromascope :: Chromascope (n.) An instrument for showing the optical effects of color.

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..

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

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

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

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

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

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

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

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..

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..

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

Synoptic :: Synoptical (a.) Affording a general view of the whole, or of the principal parts of a thing; as, a synoptic table; a synoptical statement of an argument..

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..

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