Definition of rockhounding in US English:

rockhounding

noun

North American
informal
  • See rockhound

    • ‘McHugh's other hobbies include golf, bowling, bird watching, and rockhounding.’
    • ‘In 1990, when rockhounding was in the news as potentially harmful to forest lands, the chapter demonstrated to the U.S. Forest Service that collecting and concern for the environment are not mutually exclusive.’