| Noun | 1. | casuarina - any of various trees and shrubs of the genus Casuarina having jointed stems and whorls of scalelike leaves; some yield heavy hardwood genus Casuarina - genus of trees and shrubs widely naturalized in southern United States and West Indies; coextensive with the family Casuarinaceae and order Casuarinales she-oak - any of several Australian trees of the genus Casuarina beefwood - any of several Australian trees of the genus Casuarina yielding heavy hard red wood used in cabinetwork tree - a tall perennial woody plant having a main trunk and branches forming a distinct elevated crown; includes both gymnosperms and angiosperms |