op·ticsBrE/ˈɒptɪks/NAmE/ˈɑːptɪks/noun[U]thescientificstudyofsightandlight光学➡ see alsofibre opticsUncountable nouns ending in –icsathletics,ballistics,civics,cybernetics,genetics,geophysics,gymnastics,linguistics,optics,orthodontics,orthopaedics,phonetics,phonics,physics,semantics,semiotics,stylistics,thermodynamics