adverb uk /ˈɒp.tɪ.kəl.i/ us /ˈɑːp.tɪ.kəl.i/
(Definition of “optical” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
(Definition of “optical” from the Cambridge Academic Content Dictionary © Cambridge University Press)
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a team of four people in rowing, or the boat that they use