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optical
optical activity
optical art
optical brightener
optical character reader
optical character recognition
optical computer
optical disk
optical double star
optical fiber
optical glass
optical illusion
optical isomerism
optical mouse
optical rotation
optical scanner
optical semiconductor
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optical double star
op·ti·cal dou·ble star (plural op·ti·cal dou·ble stars)


noun 
Definition:
 
2 stars appearing close together: a pair of stars that appear to lie close together as viewed from Earth but are actually a long way apart, lying along the same line of sight
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