Definition of optical in English:

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Pronunciation: /ˈɒptɪk(ə)l/


1Relating to sight, especially in relation to the action of light: optical illusions
More example sentences
  • Radio astronomy is a young field relative to optical astronomy.
  • Hooper declared at the outset of his book that optical toys could hone visual perception and, consequently, prime social vigilance.
  • The new system should help remove the optical trickery that occurs when assistant referees fail to position themselves correctly on the sidelines.
1.1Constructed to assist sight: an optical aid
More example sentences
  • For some, the use of optical aids compromises genius, and art with it.
  • Counting how many Pleiads you can see without optical aid is a good test of both your vision and observing conditions; most people see 6 or 7.
  • Normally, when Christine and I do any serious bird watching, it is with the Core Team and their plethora of optical aids and identification tomes.
1.2Relating to the science of optics.
Example sentences
  • Abbe described the optical process so well that this paper has become the foundation upon which much of our understanding of optical science rests today.
  • The list even includes a professor of optical sciences, Charles Falco.
  • Astronomy is one of the oldest and truest champions of optical science.
2 Physics Operating in or employing the visible part of the electromagnetic spectrum: optical telescopes
More example sentences
  • Of course, the capabilities of optical and infrared telescopes also continued to improve.
  • The paper shows that positrons can see defects better than either optical or electron beam microscopes.
  • Whether the telescope is operating as an optical or an infrared instrument, rarely will there be an astronomer peering through an eyepiece at the Keck's images.
2.1 Electronics (Of a device) requiring electromagnetic radiation for its operation: integrated optical circuits
More example sentences
  • Here's a look at how test sequencers can speed up tests on optical devices, saving time and money.
  • Available optical devices such as CDs and DVDs record information on the surface of the disc.
  • Such a device might one day become the CPU of an optical computer.


(opticals) Indian
A pair of glasses: he pushed his opticals on to the bridge of his nose



Pronunciation: /ˈɒptɪk(ə)li/
Example sentences
  • But hand recounts of optically scanned ballots will go a long way toward addressing doubts about that technology and about the vendor.
  • To illustrate, let us consider a ray of light passing through a cube of optically denser material.
  • The parabolic reflectors focus their respective wavelengths onto mechanical devices that act like shutters to optically modulate the beams.

Words that rhyme with optical


For editors and proofreaders

Line breaks: op|tic¦al

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