Definition of tree mouse
1 : any of numerous small arboreal myomorph rodents: such as a : any African long-clawed murid of Dendromus or related genera b : either of two cricetids of western North America that are congeneric with the lemming mice c : any of a genus (Vandeleuria) of tropical eastern Asian climbing murids with very long tails and the great toe of the hind foot opposable and resembling a thumb
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