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optics▼(physics of light and vision)noun[UK: ˈɒp.tɪks] [US: ˈɑːp.tɪks]
optician [opticians]▼(a person who makes or sells lenses, spectacles)noun[UK: ɒp.ˈtɪʃ.n̩] [US: apˈtɪʃ.n̩]
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