/ Dictionary / Index W wallaby: Meaning and Definition of Find definitions for: wal•la•by Pronunciation: (wol'u-bē), [key] — pl. -bies, -by. 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. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: wallaby (Thesaurus) wallaba Wallace Related Content Daily Word Quiz: banshee Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language