Definition of thylacine
- a doglike carnivorous marsupial with stripes across the rump, found only in Tasmania. There have been no confirmed sightings since one was captured in 1933, and it is probably now extinct. Also called Tasmanian wolf.
- Thylacinus cynocephalus, family Thylacinidae
mid 19th century: from modern Latin Thylacinus (genus name), from Greek thulakos 'pouch'