any of several Australian gum trees of the genus Eucalyptus, especially E. microtheca, abundant along riverbanks and having sickle-shaped leaves and wrinkled, cracked bark.
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British Dictionary definitions for coolabah
an Australian myrtaceous tree, Eucalyptus microtheca, that grows along rivers and has smooth bark and long narrow leaves
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012