coolibah /ˈkuːlɪˌbɑː/ noun1 •Any of a number of eucalyptus trees of central and northern Australia, in particular Eucalyptus microtheca.Oh there once was a swagman camped in the billabong, Under the shade of a coolibah tree, And he sang as he looked at the old billy boiling, 'Who'll come a'waltzing Matilda, with me.' — 1895 formscoolibahs