nailtail wallabyEnglishOxford Dictionary of Englishnailtail wallaby /ˈneɪlteɪl / ▸ noun a brightly marked Australian wallaby with white stripes on the cheeks, hips, and behind the arms, and a small horny nail at the end of its long, slender tail. Genus Onychogalea, family Macropodidae: three species.