rockhopperPronunciation: /ˈrɒkhɒpə/ (also rockhopper penguin)Definition of rockhopper noun a small penguin with a yellowish crest, breeding on subantarctic coastal cliffs which it ascends by hopping from rock to rock. Eudyptes chrysocome, family Spheniscidae rockhopper in other Oxford dictionaries Definition of rockhopper in the US English dictionary