Definition of optronics in English:

optronics

Pronunciation /äpˈträniks/ /ɑpˈtrɑnɪks/

plural noun

treated as singular
short for optoelectronics
‘‘As they move into optronics, these firms will be able to continue to use Ireland,’ he says.’
  • ‘The creation of the actual job figures, predominantly well paid and highly-qualified posts, was not recorded in the report, but the areas of software, telecoms, pharmaceuticals and optronics show the most growth.’