Definition of organo- in US English:

organo-

combining form

  • 1Biology
    Relating to bodily organs.

    ‘organogenesis’
  • 2Chemistry
    (forming names of classes of organic compounds containing a particular element or group) organic.

    ‘organochlorine’
    ‘organophosphate’

Origin

From Greek organon ‘organ’; organo- (sense 2) from organic.