Entry 1 sense Webster, 1913 Petrogale /(pē̇*trŏg"ȧ*lē)/ · Pe·trog·a·le · IPA 01 n. Any Australian kangaroo of the genus Petrogale, as the rock wallaby (Petrogale penicillata). 1. Any Australian kangaroo of the genus Petrogale, as the rock wallaby (Petrogale penicillata).(Zool.)