Definition of optical double in English:

optical double

Syllabification: op·ti·cal dou·ble

noun

Astronomy
  • Two stars that are in the same line of sight as seen from the earth, but that may be at far different distances. See also double star.
    More example sentences
    • At first he figured that such pairs consisted of two stars vastly distant from each other but coincidentally lying along a single line of sight - a visual phenomenon we now call optical doubles.
    • The physical doubles (or binary stars) are much more numerous than the optical doubles.

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Pronunciation: kəːf
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a slit made by cutting with a saw