noun, plural wallabies (especially collectively) wallaby.
any of various small and medium-sized kangaroos of the genera Macropus, Thylogale, Petrogale, etc., some of which are no larger than rabbits: several species are endangered.

1790–1800; < Dharuk wa-la-ba

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World English Dictionary
wallaby (ˈwɒləbɪ)
n , pl -bies, -by
1.  any of various herbivorous marsupials of the genera Lagorchestes (hare wallabies), Petrogale (rock wallabies), Protemnodon, etc, of Australia and New Guinea, similar to but smaller than kangaroos: family Macropodidae
2.  slang (Austral) on the wallaby, on the wallaby track (of a person) wandering about looking for work
[C19: from native Australian wolabā]

Wallaby (ˈwɒləbɪ)
n , pl -bies
a member of the international Rugby Union football team of Australia

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

kind of small kangaroo, 1826, from native Australian wolaba.
Online Etymology Dictionary, © 2010 Douglas Harper
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