Leadbeater's possumPronunciation: /ˈlɛdbɛtəz/Definition of Leadbeater's possum noun a small grey and white Australian possum, living only in high-altitude eucalyptus forests in eastern Victoria, where it feeds on gum. Gymnobelidus leadbeateri, family Petauridae Origin:named after John Leadbeater (circa1832–88), Australian taxidermist