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optic vesicle
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
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opt-out

opt-out (plural opt-outs)


noun 
Definition:
 
U.K. decision to become self-governing: a decision taken by the administration of a hospital or school to remove itself from local authority control and administer its own affairs ( often used before a noun )

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