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optical US English

Of or relating to sight, especially in relation to the physical action of light

optical art US English

Another term for op art.

optical axis US English

A line passing through the center of curvature of a lens or spherical mirror and parallel to the axis of symmetry

optical bench US English

A straight rigid bar, typically marked with a scale, to which lenses, light sources, and other optical components can be attached

optical fiber US English

A thin glass fiber through which light can be transmitted

optical glass US English

A very pure kind of glass used for lenses

optical path US English

The distance of the path that in a vacuum would contain the same number of wavelengths as the actual path taken by a ray of light traveling through a medium

magneto-optical US English

Of, relating to, or employing both optical and magnetic phenomena or technology

optical density US English

The degree to which a refractive medium retards transmitted rays of light

optical double US English

Two stars that are in the same line of sight as seen from the earth, but that may be at far different distances

optical isomer US English

Each of two or more forms of a compound that have the same structure but are mirror images of each other and typically differ in optical activity

optical scanner US English

A device that performs optical character recognition and produces coded signals corresponding to the characters identified

optical activity US English

The property (displayed by solutions of some compounds, notably many sugars) of rotating the plane of polarization of plane-polarized light

optical brightener US English

A fluorescent substance added to detergents in order to produce a whitening effect on laundry

optical illusion US English

An experience of seeming to see something that does not exist or that is other than it appears

optical microscope US English

A microscope using visible light, typically viewed directly by the eye

optical rotation US English

The rotation of the plane of polarization of plane-polarized light by an optically active substance

optical turnstile US English

An access control system without barriers in which those attempting to enter are evaluated by closed-circuit television or other visual means

optical tweezers US English

A device that uses light from a low-wattage laser to manipulate individual molecules within cells

optical centring New Oxford Dictionary for Writers & Editors

positioning text on a page so that it appears to be centred though by measurement it is not

optical character recognition US English

The identification of printed characters using photoelectric devices and computer software

disk US English

An information storage device for a computer in the shape of a round flat plate that can be rotated to give access to all parts of the surface. The data may be stored either magnetically (in a magnetic disk) or optically (in an optical disk such as a CD-ROM)

disc US Thesaurus

the sun was a huge scarlet disc

disk US Thesaurus

a box of blank disks

indicatrix US English

An imaginary ellipsoidal surface whose axes represent the refractive indices of a crystal for light following different directions with respect to the crystal axes

optical indicatrix in indicatrix US English

An imaginary ellipsoidal surface whose axes represent the refractive indices of a crystal for light following different directions with respect to the crystal axes

optical disk in disk US English

An information storage device for a computer in the shape of a round flat plate that can be rotated to give access to all parts of the surface. The data may be stored either magnetically (in a magnetic disk) or optically (in an optical disk such as a CD-ROM)