1. any of several trees of the genus Eucalyptus, esp. E. camaldulensis, having smooth, gray bark.
2. the hard, reddish wood of this tree, used for making railroad ties, fence posts, etc.
3. See sweet gum (defs. 1, 2).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.