n. Any of several unrelated trees that have dark, deeply furrowed bark
the GNU version of the Collaborative International Dictionary of English
The Australian Eucalyptus Sideroxylon, used largely by carpenters and shipbuilders; -- called also ironwood. Also applied to other Australian eucalyptuses with a hard, solid bark.
The Century Dictionary and Cyclopedia
n. In Australia, certain trees having a solid, close bark, especially species of Eucalyptus. See ironbark-tree.—
Word Usage
"When I was growing up, we used to cut a selection of trees from the ironbark scrub in the house paddock and turn the verandah into a forest."