Any of various Australian gum trees (family Myrtaceae), especially of the genera Tristania and Tristaniopsis, that are usually found growing near watercourses or in damp habitats.
Origin
Early 19th century.
Definition of water gum in US English:
water gum
noun
Australian
Any of various Australian gum trees (family Myrtaceae), especially of the genera Tristania and Tristaniopsis, that are usually found growing near watercourses or in damp habitats.